I think that identity crisis can happen at any age, so for your H to have significant changes with his behavior and interests....it's definitely a way of him figuring himself out.
Talking about identity crisis, my H started to grow a mustache. he's never done this in the 10+ years I've known him.
If his ways are not affecting you too much, let him do his thing and see if he could figure it out...which I think you are already doing great with that.
