Key question here. I’d take it at 37 and go back to being 17 with the skills, knowledge, and experiences and most importantly income of my 37 year-old self. But, I’d pass myself off as 18. Unless, of course, it’s not a secret. In which case the strategy totally changes.
If it’s known and knowable that I took this drug, then I’d take it at 55 and de-age to 35. Then, when my kids are in their teens and tweens, I’ll have the energy for their B.S. Also, when I retire at 95 (b/c seriously, retirement wont be a thing for me), I’ll only be 75 and I’ll still be able to fight off some of the horde of lawyer-bots, advertisclones, and chain letters that are coming after my pension.
I was thinking 15 so I can do homework in high school and get As instead of Bs to play the whole “good college” game. Maybe actually try on SATs. Etc.