As someone responsible for volunteer coordination for a non-profit, I don't want to deal with people who aren't there due to passion for our mission. I actually developed conflict management training for volunteer coordinators of a certain non-profit that used a lot of college age volunteers who were generating a lot of drama due to their in-dating.

THIS. But be mature, diverse, and kinda picky about what organizations you volunteer for, in what roles, and how much. Be especially wary of bringing your day job technical skills & attitude to a volunteer organization. (The food bank is far, far more likely to need food and reliable food handlers than it is to need you building a fancy new AWS-hosted web site & database for them.)

This only works if you're in an area that isn't hypersaturated with retirees. Nearly every volunteer event I attend has people that are mostly 20-30 years older than me.