How PhenoAge Changes with Age: A Research-Supply Perspective
PhenoAge is a biological age clock derived from clinical biomarkers. This page summarises research on how PhenoAge changes with age, including studies on seasonality, calcium alpha-ketoglutarate, and genetic susceptibili
What is PhenoAge?
PhenoAge is a biological age estimator, often referred to as a phenotypic age clock. It belongs to the class of aging biomarkers known as biological age clocks, which are calculated from blood or saliva samples and used to assess the pace of aging and age acceleration—the difference between chronological and biological age [1]. Unlike epigenetic clocks that rely on DNA methylation, PhenoAge is derived from standard clinical biomarkers. The evidence block does not provide a sequence, formula, or molecular weight for PhenoAge, as it is a composite score rather than a single molecule.
The research on PhenoAge and related biological age clocks centres on pathways and processes involved in aging, including metabolic and cellular pathways that can be modulated by interventions such as calcium alpha-ketoglutarate (CaAKG) [2].
Research Studies
PhenoAge and seasonality in adults
A clinical trial is evaluating the effect of seasonality on biological age in adults [1]. The study aims to provide insights on how seasonal variations influence biological age and to enhance the design and analysis of long-term lifestyle interventions targeting biological clocks. This research is ongoing and has not yet reported results.
PhenoAge and calcium alpha-ketoglutarate in middle-aged and older adults
A randomized, double-blind, placebo-controlled clinical trial is evaluating the effects of calcium alpha-ketoglutarate (CaAKG) supplementation on biological aging and age-related health indicators in middle-aged and older adults [2]. Alpha-ketoglutarate (AKG) is a key intermediate in the Krebs cycle and has been investigated for its potential role in modulating aging-related metabolic and cellular pathways. Due to the poor oral bioavailability of free AKG, its stabilized form—calcium alpha-ketoglutarate (CaAKG)—is used to enhance absorption and additionally provides calcium supplementation benefits. At the population level, there is currently a lack of systematic assessment studies on the effects of CaAKG [2]. This trial is ongoing and has not yet reported results.
PhenoAge and genetic susceptibility to epigenetic age acceleration in Asian populations
A genome-wide association study (GWAS) was conducted on multiple epigenetic clocks to explore ethnic differences and individual variability in Asian populations [3]. The study identified Asian-specific genetic susceptibility for epigenetic age acceleration. This finding is relevant to understanding how biological age, including PhenoAge, may change with age, but it is specific to epigenetic clocks and not PhenoAge itself. The study is reference-only and does not provide direct evidence on PhenoAge changes with age.
PhenoAge and age acceleration
Biological age clocks, such as PhenoAge, are emerging as valuable tools for assessing the pace of aging and calculating age acceleration—the difference between chronological and biological age [1]. Age acceleration is a key concept in understanding how PhenoAge changes with age, as it quantifies whether an individual is aging faster or slower than expected based on chronological age.
PhenoAge and lifestyle interventions
Research on seasonality and biological age aims to enhance the design and analysis of long-term lifestyle interventions targeting biological clocks [1]. This suggests that PhenoAge may be influenced by environmental factors such as season, but the evidence is currently limited to ongoing studies without published results.
PhenoAge and metabolic pathways
Alpha-ketoglutarate (AKG) is a key intermediate in the Krebs cycle and has been investigated for its potential role in modulating aging-related metabolic and cellular pathways [2]. While this research is focused on CaAKG supplementation, it highlights the broader context of metabolic pathways that may influence biological age clocks like PhenoAge.
PhenoAge and cellular pathways
The study on CaAKG supplementation evaluates its effects on biological aging and age-related health indicators [2]. This research is relevant to understanding how cellular pathways may affect PhenoAge changes with age, but it is specific to CaAKG and not PhenoAge directly.
PhenoAge and population-level assessment
At the population level, there is currently a lack of systematic assessment studies on the effects of CaAKG [2]. This gap extends to understanding how PhenoAge changes with age across populations, as large-scale studies are needed to draw robust conclusions.
PhenoAge and ethnic differences
A GWAS identified Asian-specific genetic susceptibility for epigenetic age acceleration [3]. While this study is reference-only and focuses on epigenetic clocks, it underscores the importance of considering ethnic differences when studying biological age clocks like PhenoAge.
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