The only such organization that I am familiar with was the local Fish and Game League in my home town. I'll start by admitting up front that I never did join it because we lived too far from town and Dad couldn't spare the time to drive me in. I did check the place out as much as I could. Membership was reasonably cross-sectioned althouh yes most of the members were older - not necessarily retirees though but probably 40-50 age bracket. They held meetings once a week. Yes, there was definitely a lot of people sitting around telling war stories about the monster buck of '68 and the 25lb walleye that got away. I like listening to those stories...once.
Anyway they would usually try to have a guest speaker brought in. Sometimes it would just be the local RCMP or Fish Cop to go over safety/hunting regs, others would be a rep from DNR to go over the results of aerial moose counts, deer forecasts, fishing reports etc etc.
They had a on-going semi-formal trophy contest for fish, and in season game too. It was really interesting and if I were in your shoes that's where I'd be. Mixed in with the war stories you'll get some good advice, you'll make some friends and may even find someone who would be willing to take you hunting or to the range with them.