Epilepsy comes along with other neuroses, yes, the relevant ones being emotional whiplash and impulsiveness. However, "I'm pretty sure epilepsy isn't making your mouth move and produce those [bleep]y statements," has left my lips. The following anger was sustained enough to not be emotional whiplash and thus not associated with epileptic brain activity.
Take comfort--he may be half your age, but he's not yet legal! (That's the break point where I'll start my existential panic, at any rate.)