You could of simply stated, if it is the case, that the problem is not in finding -somebody- that wants to date you, but finding somebody -you- would like to date where the feeling is mutual.
It covers the bases of;
1. Deflecting what is seen as an unreasonable expectation of yourself and women in general.
2. Politely letting him know, should he be fishing for an opportunity, that you are not interested.
I think that in most cases people's intentions and motives are not singular. He -might- be an old dude that wouldn't mind getting it on with you, but he could at the same time be complimenting you. Accept compliment, deny access to goodies, steer future conversations in safe direction...protocol established
Interesting approach.
You could also tell him how embarrassingly and blindingly white your butt is and enjoy observing his reaction
I like doing things like this...inappropriate can be fun sometimes...
Definitely.