I don't know. I think I for the most part miss the period before my parents' divorce. That was I guess the period of actual childhood. Maybe before 5th grade. Childhood innocence and all that. Since 5th grade, I've felt the same really.
Oddly, looking back, I miss most out of my childhood, my Bosnian babysitter's family, and hanging out with my father.
However, now as an adult, I'm afforded some measure of freedom to pursue what I want. But I feel in essence, because my childhood was disrupted by the divorce and all accompanying things that caused my life to spiral out of control, I only work to regain back the happiness I had as a child, and achieve basically my childhood goals (as a kid I wanted to be an athlete.) In some sense, everything has come full circle.
The question I ponder a lot lately is, would childhood me think adult me is cool? And... I used to think not, but after some examination of myself... Yeah, he would. And I think that's what counts. I only wish it didn't come with the hardship. Maybe I'm still a kid, though I feel like a 90 year old man, too. What a weird dichotomy.
As a kid, I always wanted to get older, so I could be more capable of pursuing what I want. And I've reached that point. So I guess the answer is no, because being a kid again would just make me wish to be an adult. However, as a kid, I did have a fear of "growing up" in that I feared having to give up "kid things" like Winnie The Pooh, cartoons, etc. However because I'm an adult and afforded freer agency, I'm freer than I was as a kid to pursue things like that (I have a Hamtaro plushie on my shelf right now) as when you're a kid people judge your "growing up" on giving up things like that, and it's looked at negatively if you don't. So again, I guess no.