University schools that has a surplus have some useful equipment for lab use.
I’m doing that with a friend and his kid- it’s older UBNT and other gear- but it give a 10yo something to start with.
What have they retired? That would be the only thing that matters on using older machine - the possibility that some newer commands aren't there.
I will be upgrading my UniFi hardware. So I have two APs that I am replacing. the Controller is a VM still.
I also had a project build of a Stand alone Point to Point wireless network for our Club. It's two UBNT M5 units and two EnGenius EAP9550 units One running DHCP, and the other a slave. The idea was that when we did a contest (Field Day) we could be across a 400yard area, and it would be nice to have internet / network for file sharing and such. I built it, it worked - and no one was interested in it. So - I'll be giving it all to him for his kid to learn on - tear up - etc....