Why do women on average prefer older men?

I've noticed something, alot of the women on this sub and in general when listing their requirements often set the age of the man they want on average about 2-5 years older, why is that? Ladies, is there a shame or uncomfortability that comes with dating a younger guy, do you find it weird or annoying. Is it biblical or is it social? why is it so dang common? I'm not salty or jealous, though I am curious and willing to hear why this is.

So would you date a younger guy? If not, why? If so, why would you and why do you think its uncommon for that to occur?