is a 15 year age gap wrong in a relationship?

hi, i’m 22(F). i work at a coffee shop & we have this regular who i’ve known since i started working there 3 years ago. i got the impression that he was interested in me and i was reciprocating the subtle flirting… long story short, i got his number today, he knows im 22 and i found out he’s 36, turning 37 in a few months, (i already knew this and was fine with it).

really what i want to know, is a 15 year age gap bad? i honestly am just not interested in men my age, i don’t know why. i’m just not. but when i told my sister, she honestly made me feel really bad about it☹️ am i making a bad decision?