I had GPs at the age of 9 and my DD got her boars when she was 9.
They are lovely, much nicer (IMO) than rabbits but I'm sure rabbit owners wouldn't agree.
So once you've eliminated allergies (fur and hay related) you need to work out where they'll go.
They do need a fair bit of space.
My adult boars had a 4'x2' night winter cage but this winter I got a 'run' for them (panel that clip together and we made an area about 5'x3' with an extra bit into the bay window) They are much happier, partly more space but I think it's more open that the cage which had a solid plastic base.
They are quite hefty animals to lift and be aware - they are very gentle but being animals , prey animals at that, they can bite.
It's not something that happens often and I'd say 99% of the time there's a good reason. Either your hands smell of food or they're protesting at how they're handles.
My GP1 is getting a bit middled aged and needs respectful handling
.
The piglet (now 6 months and massive) is a clothes puller or if there's the smell of hay he will pinch my skin.
But he doesn't like being lifted if your hand slips under his armpit. He'll do a 'snap' or he kicks (weird).
As an adult, or for DD , no problem. But for a 4yo it might be.
And YY friday. Look at Gumtree (not to buy) but see how many GPs are up for rehoming because the "child lost interest".
My boars are Rescue and they have a lifetime commitment that they will take them back if ever it occurs I can't keep them.
Funnily enough I can't find that bit of paper with the guarentee......last time I saw it, GP3 was reading it.