I have a lot of kids so I can’t answer that question

but reddit asked it 2 days ago, word for word https://www.reddit.com/r/AskReddit/comments/1gdm2wj/people_in_their_40s_and_50s_with_no_children_how/

I just think it’s interesting to look at the difference in the user replies

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Do all the cool physical things you want to do now, like mountain climbing, martial arts, skiing whatever. You can still do all of that at 40 but it’s harder to find time and you’re much more injury prone.