I'm in this boat. As the kids get older they have more to do, which means less time for me. I was already becoming apathetic to doing things I once was passionate about (mountain biking, for one), now I have a legitimate reason.
I do play poker once a month or so, but I'm not super passionate about it.
I like tasting new beers, but it makes me bloated. I'm starting to become "blah" about drinking alcohol in general.
I don't read. Not super artistic. Only work out to lose weight, not because I like it.
So yeah, nothing really. Which is kinda sad.