You have a magic pill, which de-ages you by 20 years. You can take it once in your life only, so long as you are at least 20. What age — past, current or future — do you reckon is best to take it?
I'd still consider the 30 year old crowd to be my peers. I am still technically 30, I just look 10. The only downside to this is like that time I saw a dwarf being accosted by an elderly woman when she saw him light up a cigarette from behind and incorrectly assumed it was a child.