Thanks. Re (4): I’m simply looking to boost his score. I do not plan to give him a card.
Current Score: 
Not bad at all for a first card. I remember my first card over 20 years ago being a Discover Card in college with an over 20% APR smh My son has a NFCU checking account but I didn’t let him apply for their credit card. Good to know he does stand a good chance of getting a decent APR once it’s time and that they allow spending caps... although I don’t plan to give him a card. Thanks.