An observational study in Aging, Aging Well and All-Cause Mortality, sponsored by Longevity Metrics, Inc.. Recruiting at 1 site in United States. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-08.
Sponsored by Longevity Metrics, Inc. · Observational
The 100-Year Human Aging Study is a prospective, pragmatic, observational trial enrolling participants across fixed clinical sites, mobile clinical sites, and an online participation pathway (current and future) to undergo comprehensive multi-system health screening and longitudinal follow-up until death. Participants are followed to determine whether measurements taken at enrollment and repeated across the lifespan - individually and in combination - predict all-cause mortality, cause-specific mortality, incident serious disease, and functional disability. The study is designed to generate the surrogate endpoint validation data that longevity medicine currently lacks.
All currently existing longevity measures are surrogate endpoints that have not been prospectively validated against actual mortality and aging outcomes. The 100-Year Human Aging Study is a prospective, pragmatic, observational trial that addresses this gap by enrolling participants in comprehensive clinical screening and following them longitudinally until death to determine which measurements - alone and in combination - are predictive of mortality, serious disease, and functional disability.
The study prioritizes dynamic measurements: the physiological, cognitive, social, and environmental capacities that change with aging and are most likely to carry predictive signal for mortality and functional outcomes. These include cardiorespiratory fitness (cardiopulmonary exercise testing with ventilatory threshold analysis), strength (grip, explosive power, functional movement), mobility and balance, neurocognitive performance, sensory function (vision, hearing, smell, light touch), and metabolic function (oral glucose tolerance, continuous glucose monitoring), in addition to other testing. Structural and imaging assessments include body composition and bone mineral density by DEXA, echocardiography, resting and stress electrocardiography, spirometry, retinal fundus photography, and vascular ultrasound. Laboratory measures are drawn on-site and processed through a CLIA-certified reference laboratory. Complete medical, surgical, family, social, occupational, and environmental histories are obtained at each visit.
Participation ranges from single-service visits - including standalone DEXA, cardiopulmonary exercise testing, laboratory panel testing, and sleep studies - to the full two-visit comprehensive screening battery. All participation pathways contribute clinical data to the longitudinal mortality and aging outcomes linkage framework regardless of service level. Participants are encouraged to return for repeat testing to build longitudinal health trajectories across the lifespan.
At enrollment and across longitudinal follow-up, the study platform generates individualized investigational constructs including biological age estimate, predicted death age, and predicted cause of death profile. These are explicitly investigational hypotheses, not validated clinical standards. Their predictive validity relative to actual mortality, aging outcomes, and functional disability is a central scientific question this study is designed to answer, both for individual measures and for composite multi-system models.
All data are archived in their highest-dimensional raw form to preserve the ability to apply future analytical methods retroactively. Participants are followed with periodic contact and offered repeat screening throughout the lifespan. Longitudinal outcomes ascertainment includes all-cause mortality, cause-specific mortality, incident serious health events, chronic disease diagnosis, functional independence, disability status, and health behavior change.
Study sites and participation pathways. The 100-Year Human Aging Study is conducted across all Longevity Metrics participation pathways, current and future: the Boulder Human Performance Lab (fixed flagship laboratory); mobile screening units including the Health Ahead Bus; any additional fixed or mobile Longevity Metrics laboratory established during the study period; and an online participation pathway through which participants enroll and contribute structured data without in-person screening. All pathways operate under a single protocol with identical procedures, data management, informed consent, and safety standards.
This study is one of four that compound into one system. The Human Observatory Study (NCT07646782) validates sociodemographic and environmental data against the same outcomes, and receives each model's geographic residuals. The Health Ahead Comparative Effectiveness Study (NCT07669168) moves the screening toward increasing automation and mobility while maintaining quality. The Longevity Metrics AI/ML Development Study (NCT pending approval) builds the models that make automation, prediction, and broad utilization possible. This study supplies the clinical data and validates what it means for health, disease, disability, and death.
2,116 studies on the registry are indexed under Metabolic Syndrome; 347 are open to participants now.
This study's planned enrollment of 1,000,000 is above the median of 197 across 496 observational studies indexed under Metabolic Syndrome.
Browse Metabolic Syndrome studies →Longevity Metrics, Inc. is the lead sponsor of 3 studies on the registry; 3 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Participants of all ages, health statuses, and demographic backgrounds presenting for comprehensive preventive health screening at fixed or mobile clinical sites. No exclusions based on health status, geographic location, language, or population group. Participants with limited decision-making capacity may be enrolled with consent from a legally authorized representative. The study actively seeks to enroll participants across the full human lifespan including older adults and centenarians.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Comprehensive multi-system clinical screening battery including cardiopulmonary exercise testing, body composition assessment by DEXA, echocardiography, electrocardiography, spirometry, neurocognitive testing, sensory assessment, metabolic testing, physical examination, and detailed medical, social, occupational, and environmental history. Participants receive individualized clinical findings and investigational longevity constructs at the conclusion of screening.
Also known as: Your Longevity Report Card
All-Cause Mortality
Vital status ascertained through longitudinal follow-up contact, mortality record linkage, and health data network linkage using probabilistic matching on name, date of birth, and address history.
Time frame: From enrollment until death, assessed periodically, up to 100 years
Cause-Specific Mortality
Cause of death ascertained via death certificate and mortality record linkage.
Time frame: From enrollment until death, assessed periodically, up to 100 years
Cause-Specific Mortality Prediction Accuracy
Concordance between predicted cause of death profile generated at enrollment and actual cause of death ascertained at follow-up.
Time frame: From enrollment until death, assessed periodically, up to 100 years
Incident Serious Adverse Health Events
New diagnosis of myocardial infarction, stroke, cancer, dementia, heart failure, atrial fibrillation, sepsis, venous thromboembolism, COPD, chronic hypoxia, or major fracture ascertained via periodic follow-up contact and health data network linkage.
Time frame: Periodically from enrollment until death, up to 100 years
Incident Chronic Disease
New diagnosis of type 2 diabetes, hypertension, COPD, chronic kidney disease, metabolic syndrome, or osteoporosis ascertained via self-report and health data network linkage.
Time frame: Periodically from enrollment until death, up to 100 years
Functional Independence and Disability Status
Activities of daily living, instrumental activities of daily living, and self-reported disability status ascertained via periodic health survey using validated open-source instruments. Higher composite scores indicate greater functional independence. Specific instruments will be selected prior to first follow-up contact and documented in the statistical analysis plan.
Time frame: Periodically from enrollment until death, up to 100 years
Biological Age Estimate Prediction Accuracy
Concordance between investigational biological age estimate and actual mortality outcomes at longitudinal follow-up.
Time frame: Periodically from enrollment until death, up to 100 years
Health Behavior Change: Composite Self-Report and Repeat Screening Index
Health behavior change assessed through two complementary measures aggregated into a single index: validated composite self-report survey administered at periodic follow-up, and change in pre-specified clinical measurements at repeat screening. Improvement in objective clinical measurements (cardiorespiratory fitness, body composition, metabolic biomarkers, and related parameters) serves as the primary behavioral activation signal. Self-report domains including health behaviors and preventive care utilization provide supporting context. Both are combined into a single participant-level health activation index. Higher scores indicate greater engagement with health-promoting behaviors and measurable clinical improvement.
Time frame: Periodically from enrollment until death, up to 100 years
Multi-System Predictor Modeling: Predictive Performance
Performance of a unified multi-domain measurement framework in predicting all-cause mortality and incident serious disease. The framework integrates clinical, biological, behavioral, social, occupational, and environmental data into a single composite model. Performance is reported for the full composite model, with pre-specified secondary reporting for individual predictor domains and domain combinations to identify which inputs are independently predictive, which are redundant, and which combinations provide additive or synergistic predictive value. Metrics are specified in the statistical analysis plan.
Time frame: Periodically from enrollment until death, up to 100 years
Plan to share: No — Individual participant data are not shared. The complete participant record includes facial and voice recordings, genomic data, and neighborhood-resolution geography, and cannot be de-identified; it is never released. Identifiable data are accessed only by approved researchers working within Longevity Metrics secure facilities under data use agreements, with no data removed. Specific derived, aggregate, and statistical outputs are de-identified to HIPAA Safe Harbor standards and may be published, shared with collaborators, or contributed to open-access research databases. Models, risk estimates, and analytic findings derived from the research data may be provided to external organizations or used commercially; no participant record and no dataset containing participant data is transferred.
Started Feb 2025 (actual). Primary completion is estimated for Dec 2099, 898 months after the start.
Of 160 observational studies under Metabolic Syndrome, half reached primary completion within 42 months of starting (the median), counting those still running; a quarter within 18 and three quarters within 106. This study's planned 898 months is above that.
How these figures are worked out, and which studies are left out of them.
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