Muninn 🍃 is a user on social.coop. You can follow them or interact with them if you have an account anywhere in the fediverse.
My grandparents decided to learn Welsh when they were 65. After two years of lessons in it (and talking Welsh with me at home, I was going to a Welsh school and was already fluent), they were fluent. My grandmother, around the same time, decided to overcome her phobia of water and had me teach her how to swim. She'd swim laps with me in the pool up into her 80s.
You're not too old and it's not too late to try something new.
@WelshPixie
Dad started learning Italian in his mid-70s and got good enough that he spent weeks at a time running around Italy with no problem, and this was probably less than a decade before Alzheimers.