One of my most memorable experiences was dating a guy 20 years older when I was 21. Still, real-life couples rarely have a generation-long discrepancy between them.
He was amazing and so much more sophisticated than boys in my university group. Most often in married couples a man is older than a woman.
Age difference between partners has long been a question of interest.
Remember your high school days when dating someone a year senior was extremely cool.
Many pairs continue a relationship that started back in high school, thus their difference will be smaller.