Looking for advice for a friend [40YO]

my homie's skills are in hard decline, even though we skate pretty regularly, like once or twice a week. it's starting to take a toll on him as he's visibly struggling not landing any tricks all day... and it's progressively getting worse. he just hit 40, that doesnt help sure but i don't think it's his age thats holding him back.

For months i though it's probably a mental blockage he needs to push through, but since lately he started struggling with basic kickflips i feel like there might be more to it. i suspect his bipolar medication to affect his motorics, but i don't really know anything about it.

I don't wanna lose my skate buddy, so here i am, asking for help. maybe someone here made similar experiences with friends. maybe someone here with bipolar1 went through something similar to my mate, changed meds and it helped (well fuck thats what I'm hoping you know).

keep shredding, oldheads, and stay save!