IMO I wouldn't say there is any specific age one should retire from the hobby. As long as a person is healthy, happy and content with the lifestyle I see no limits. That's one of the fun things about it. There are no set rules when it comes to stuff like that. Everyone plays to their own beats.
I can't predict what age I'll be when I'm fully 100% retired. I enjoy what I do so it's hard to picture life with no hobby at all. However, by choice I've decreased to very low volume and seldomly see new clients. Spending and saving wisely has allowed me to fall back and explore other interests. I'm sure once I graduate and settle down I will fall back even more but who's to say what the future holds! One thing is for sure I'll alwyas be a freak by nature lol
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P.s happy to have you back SNL!!