I've gotten a surprisingly good deal on lenses and cameras on shop Goodwill. My xsi was less than 50$ with shipping. Is it current gen or anywhere near perfect for Astro? Nope. But for the price, it'll do.
Waiting for clear skies to test my og star tracker with it and a 50mm f1.4 lens. I've gotten ok untracked shots but I lose a lot with the shorter exposures
I'm in the anti-ban camp because restricting access to knowledge due to arbitrary lines like age is the opposite of learning. It is up to the reader and their mentors to guide their reading depending on ability and maturity as needed. No two people will have the same levels at the same age so books appropriate for one may not be appropriate for another.
That said, to nitpick a tad: pointing to the Internet when on a discussion of book banning or restrictions is more "red herring" or "false equivalence" than strawman.