[Bloody Sam Roberts]

I used to think it would be good to have my body rejuvenated to 18 or so, but only if I could retain whatever I had learned since that age

And there is the thing that all of us had said on so many occasions for so many incidents/memories/mistakes;

"If I knew then what I know now. Oh boy."

[HartleyMBaldwin]

Actually, my point was that I’d probably still do stupid stuff. You’ve heard the expression young and dumb and full of...energy, yeah that’s it, energy. I suspect that two of those conditions are enough, even if one isn’t quite as dumb as before.