https://en.wikipedia.org/wiki/Age_disparity_in_sexual_relationships

According to the data here from the US census bureau, the number of men married to younger women is significantly higher than the number of women married to younger men, even in the 2-3 (19.6% vs 6.9%) and 4-5 (12.8% vs 3.4%) year range. Of course RP prefers younger women, but what are some real answers? My mom is two years older than my dad and I’ve heard people in their own generation (late Boomers) say that’s unusual. Is there a non RP explanation?