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?
Getting 20 years back means I can correct a lot of mistakes and I'll have way more energy and focus to be the me I want to be. My 20s were so stressful I started getting white hair.
I added some words to clear it up. I often write how I talk, which is to say extremely informal. Around my area it all makes sense. It was meant to imply that I don't have those things so I'm not abandoning anybody or leaving anybody. If you were able to magically de-age yourself it would be viewed as somewhat selfish.