I have a 14 year old Cat who does the same.
He used to play fetch, but hasn't in a while. He runs around the house like he has a bee in his rear-end. He likes to be the centre of attention and whenever we're all at the dinner table, he must be there too (hoping to get any food scraps) He thinks he's a dog as he comes when he's called. One day I came in the door from night school and he wasn't at the door as he usually was to greet me - he was on my mothers lap - i chasised him saying "why aren't you here greeting me?" He meows and runs up the stairs and greets me! He's a loving but crazy kitty who at 14 still thinks he's a kitten!