FWIW one of the factors in choosing my current employer (I'm not "old" by any other industry's standards, but starting to have some visible grey in my hair) was how many of the people I met there who were older/more experienced, married with kids, etc.

Which is nice. People care about work/life balance, have been around the block a few times so there's less stereotypical startup attitude. Also some of the best in-office conversations with co-workers I've had.