John get an electric!
When I started playing bass at age 11 I got a 3/4 neck size.
Get something comfortable and half way decent.
You're going to have to take him with you to see what fits.
He's at that age where he you might be better off getting him a full size, really depends on his height/arm length.
Plus that will save you money when he grows out of the 3/4 in 6 months.
You can get killer package deals this time of year. Get a small amp that has a head phone jack so he can play and not disturb any one.
Get a crate amp and entry level name brand guitar that way it's worth something if he sticks with it and wants to upgrade or if he doesn't you can recoup some money.
A lot of the good shops will sell you a package, guitar, amp, strap, case, some books and lessons.
Good luck and rock out!
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