I answered plus or minus ten years, but that's very negotiable. After all, dating is just dating-- it's only when you're serious that age differences have real significance, and it's been years since I've dated anybody with serious intent. The biggest age difference I've ever experienced was when I had a couple of dates with a 35-year-old woman when I was 21, and a serious relationship would have been a bad idea; she's well past retirement age now.