Is it normal for a 45 year old man to still act a little childish?

I don't know if it's normal, but IMO it's healthy. I've been really fortunate that in my line of work, growing up wasn't too important. It's kinda cool when some super rich guy hands the keys (figuratively) of his multimillion dollar toy to you and says, "Let's go play." Of course there is some responsibility and lots of work involved, but bottom line, your job is to play with some very expensive toys. Oh goody, goody gumdrops! Anybody wanna ask their mommy if they can come out n play with me?