I read a fascinating article on genetic age vs chronological age. Basically the TL;DR of it was that if you treat your body like shit, it genetically ages faster than your chronological age. In a study they showed pictures to people, and almost every human guessed closer to the genetic age than the chronological age... so both those fat fucks are most likely genetically the age you think they are... even though chronologically they're most likely both 10 years younger. Genetic age determines actual life span... not chronological age.