Men often pursue younger women, even if they aren’t interested in a family. Men certainly have a shorter average lifespan than women, but this doesn’t tell you anything about a particular guy.
The typical reason being, “that’s who I’m more attracted to.” But again, the “sex appeal boundary” gets pushed out further and further as women in their 50’s and 60’s find themselves as public sex symbols. Is it wise for a woman of 55 to consider a relationship with a man who is 65 or 70?
“The heart wants what the heart wants” is a cliché that couldn't be more accurate. Love doesn't care if someone is older or younger, but we certainly do.
Society holds a negative stigma regarding age differences, which causes people to obsess over it.
Maturity is something that develops after experiences we face in life; you don't just magically become mature on your 25th birthday.