“…Men and women who are at similar stages in the life course will have similar needs and orientations and will therefore more highly evaluate their interactions. Because young women begin adolescence and adulthood more quickly than boys and young men (e.g., Corijn & Klijzing, ), they are observed to choose male partners who are on average several years older and vice versa (Buunk, Dijkstra, Kenrick, & Warntjes, ; Ni Bhrolcháin, ; Ni Bhrolcháin & Wendy, ; for Germany, see Klein & Rapp, ). Apart from age, many other traits could be relevant, particularly ethnicity (Blau et al, ; Klein, ) and education (Becker, : 30ff; Blossfeld & Timm, , ).…”