Do you recall what age you were when you stopped wishing you could be older? What were your reasons for wanting to turn the clock ahead?
Though I don't recall how old I was when I stopped, I do remember at least one reason for that irrational wish - wanting to be old enough to be able to drive. I suspect I'm not alone on this. I also have a vague recollection of wanting to be old enough to not have to obey my parents anymore. Because although my folks weren't as strict as the parents of some of my friends, they were far from permissive. I yearned to make my own rules.
Now, put it in reverse (apologies to any reader more skilled than I at the here-and-now bit): That is, how old were you the first time you wished you were younger? Reason(s) for turning the clock back?
Here my memory is clearer. I had my first premature mid-life crisis at twenty eight soon after my singing voice gave out. Because I was emotionally unprepared to support myself doing something aside from playing music, at the time I vividly recall wishing I could start college all over, i.e. be seventeen again. In an impulsive attempt to postpone the inevitable - i.e. find a job - I then stuck out my thumb and hitchhiked across the country, hoping my singing voice would return with some rest. It never did; twenty-nine loomed.
I'll spare you the details of my other premature mid-life crises. Suffice to say each was accompanied by a similar, short-lived wish for a do-over. I've had long stretches being good with the here and now but there are probably no medals awaiting me for being a good Buddhist, at least not in this life.