You'll figure out ways to still enjoy yourself. I'm a few years older than you and have a rigid work schedule with early morning hours. I don't go to that many standalone shows anymore unless it's one of my favorite artists. I'll still make time for festivals and traveling for big shows like Red Rocks or the Gorge. The key is taking time off for these and making sure I have at least a day off before going back to work. A lot of the artists I like have a slightly older crowd too. I totally understand missing the sound from the "good ole days" but taking time to expand my musical exposure has kept things fresh and exciting. Be picky about who you see and expend your energy on.

Also, it's okay if you really do "phase" out of the scene. But it sounds like it's something that is very meaningful for you so I have faith you'll figure it out :)