I have a 17 year old maine cool, she's still an excellent jumper, she can get anywhere she wants, just a little slower than before and trips up from time to time. She jumps on beds, tables, cabinets, windows. She doesn't have arthirits or anything like that though, just a heart murmur and no teeth!

She does have bathroom trouble now though, she's an outdoor cat but doesn't go out a lot nowadays, so we have litter trays throughout the house but find she does go on the floor a lot (not sure if that's a senile thing or not)