Everyone has both a psychological and a chronological age, and the former is largely genetic. My mother drank a fair bit, smoked and was a sun worshiper (perfect storm for cell cross linkage), at 75 now everyone thinks shes maybe 60. I'm 47, no grey hair and very few lines in my face. The guy who hired me where I work as an engineer, I thought was in his early 50s. . He's 37.