75+. Lower limit is illegal in the US. Problem with polls like these is that I don't want to select a standard for myself. "Oh I really like this girl or boy, but he or she's above/below my age limit, and as such I won't date him or her." Who sets standards for oneself like that? That said, the generic 80-year-old doesn't look very attractive to me. But shallow standards are stupid to have. It really depends on the individual case.