I can remember my mate getting a few ewes one year when he was about that age. Thing was,.the farm already ran about 200 of them.... I believe the phrase he used later was "great, dad. I'll just stick em with the others then, shall I?"
When I was his age, if there was no 'girl' option available, I'd have liked (in no particular order): a .410, sheet music for my guitar (in his case, fiddle), stuff for rabbiting/ferreting, fishing kit, sharp things (knives etc).... Any of those things fit?