Previous Keywords Biomarkers of aging Anti-aging Physical activity Human Telomere length (TL) is a measure of replicative senescence (Aubert and Lansdorp, 2008) and a proposed marker of biological aging (Bekaert et al., 2007). TL decreases progressively with aging (Gilley et al., 2008) and is associated with numerous pathologies (Brouilette et al., 2007, Demissie et al., 2006, Fitzpatrick et al., 2007) and all-cause mortality (Cawthon et al., 2003, Farzaneh-Far et al., 2008).