America's in-person group membership plummeted across the decades[0], but I don't know about overall volunteerism. It may just come in different forms. Anecdotally, here in NYC volunteer orgs are stuffed to the gills; spots to clean my local park fill up in days, finding any weekend activity on NY Cares can be hard.
More concrete data are hard to find, AmeriCorps' only started in '02. We can look at volunteer rates across demographics[1] but it's likely true that volunteer hours drop off with age.
[0] see: Bowling Alone (needs a post-COVID update, though)
More concrete data are hard to find, AmeriCorps' only started in '02. We can look at volunteer rates across demographics[1] but it's likely true that volunteer hours drop off with age.
[0] see: Bowling Alone (needs a post-COVID update, though)
[1] https://americorps.gov/sites/default/files/document/Voluntee...