that work with kids and young adults.
"young adult" can vary by the age of the person making the comment.
I always suggest Stamps for the Wounded
in operation since 1942 offering stamps and services to wounded US veterans throughout the country. It has even been honored on a Disney character postage stamp. IT can be found here: https://www.stampsforthewounded.org/
John Hotchner, if you know the name, is one of the contacts and he has been involved for decades.
Edit: 100% volunteer organization.