I'm a bit sad that several of my interests (audio gear, camera gear and sports cars) acquired a long time ago increasingly look like old guy interests. And I'm disgusted by the rich guy/conspicuous consumption aspect to those interests.
Gear head hobbies now seem sterile to me and gearhead forums seem populated by people I'd rather not know. However, listening to good music, looking at pictures of subjects I value and driving on winding, country roads are still rewarding activities for me. Those interests attract positive, interesting people.