Let me turn away from the "goofy old guy routine" discussion.
I do weddings. I'm also quickly becoming an old guy (48). I also fully realize that 20-something brides, generally speaking, do have an aversion to old dudes. After a couple of seasons of hiring different DJs I see a pattern forming. The guys/gals who present better are received better, period. I have one guys who is 55-ish and overweight. Of the bunch, he's probably the best DJ and he's forgotten more production chops than I'll ever have. Still, I've had to cut back on booking him because of the complaints, most of which I feel are generated simply because he's an old guy.
And yes, part of my business plan is to slowly begin replacing even myself with younger talent.