One of my groups, mostly graduate degrees except for me and the professional comic book artist, I think we are all over 50, or close.
One of my groups, everyone's in their mid-30's - oh maybe someone just turned 4-0.
Another group is my high school gaming group, so we are all 59.
2 other groups has some of our kids in it, so range from HS up through old guys like me
Last group mostly 40's / 50's, but DM just brought in a co-worker who brought down the median age significantly, and also reduced the percentage of Y-chromosomes too (thank god!)