The present study examined desired minimum and maximum ages for mates across five different levels of relationship involvement (marriage, serious relationship, falling in love, casual sex, and sexual fantasies) comparing individuals of 20, 30, 40, 50, and 60 years old. Consistent with previous findings, women preferred partners of their own age, regardless of their own age and regardless of the level of relationship involvement. Men, on the other hand, regardless of their own age, desired mates for short-term mating and for sexual fantasies who were in their reproductive years. However, with regard to long-term mates, men preferred mates who, although younger than them, were sometimes above the age of maximum fertility. Explanations for these findings are discussed. (C) 2001 Elsevier Science Inc. All rights reserved.