Currently this is GK included. I could relatively easily break it down by position, and get a mean age for each team and plot that on a scatter maybe.
I'd like to compare to past seasons but as yet haven't found a reliable source that gives minutes played for each player. I've found apps but that doesn't give as clear a picture.
As an outsider who's used to good data, I'm amazed at how exceptionally poor the data in football is. Hopefully, some of that will change soon.
https://fbref.com
(although I think they've missed their target for opening the database)