My family (dad, mom and 2 sisters) never understood why my brother who is 11 months older than me always dated women that was twice his age except for now they are around 15-20 years older. Whereas I always went the opposite, usually 13-27 (current) younger than me. They understand mine and accept it more than they accept his. I say whatever rocks your world. Currently, my partner is 27 years younger (she is 38) than me and that has not been an issue yet.