At what age did you stop giving a fu*k what people think about you?

By 35 I was well on my way to not giving a flying duck to what anyone else thought of me. Now at 36 I give zero fracks to what people think of me. I stopped wearing makeup and dressing in a provocative way. I haven’t been to the gym since July last year. I cut off all my frizzy long hair in November. And I did everything purely for myself not caring what anyone else thinks. I got tired of trying to impress people. So at what age did you start to not care what people thought about you?