Article states they had fewer biomarkers of aging, and showed less age-associated obesity, fraility, and metabolic decline. So their "youth" period extended longer.
Actually the point of healthspan vs lifespan is made in the introduction -- it was a justification for using mice for this study, which have clear health phenotypes that are analogous to humans.
Actually the point of healthspan vs lifespan is made in the introduction -- it was a justification for using mice for this study, which have clear health phenotypes that are analogous to humans.