Hello all!

I'm wondering if anyone has experience with older snakes and knows if they have any strange behaviors. My snake is around 20 years old and recently has become VERY active but will not eat. If I'm in the room during the day he'll start slithering around his tank and I'm pretty sure he's non-stop moving at night. Also, even if he's resting he'll be sprawled out instead of curled up in his hide. He's had these hides for a while so I know he can use them, just seems to have no interest.
His tank is PVC with Plexiglas doors, warm side is 88-90, cold side is 75ish, humidity around 60.

I've tried offering him a variety of rat sizes (dead prey) and tried feeding both in his own tank and a separate one.

I know snakes can go a long while without eating, so mostly I'm concerned that he isn't using his hides anymore and want to reduce any possible stress he has.

Any advice would be greatly appreciated! Thanks!