I don't like the belts that tour players wear nowadays -- the ones with gigantic rectangular buckles:
A belt like that could be problematic for golf, because it might go off when you leaned over to line up a putt. But my favorite grown-up belts are perfect, because their buckle is also a beer opener:
The two on the ends in the photo look the same, but they're not. (The one on the right is for formal occasions.) The buckles really work, too. My brother visited over the weekend, and between golf days we took my wife out to dinner at a Thai restaurant that doesn't have a liquor license yet. We remembered to bring beer but forgot an opener, so I took off my belt and handed it across the table. Problem solved.