My cat is 17 but still very active and happy. We've taken her to the vets twice in the last nine months, but everything is fine. However, she's become very clingy. Whenever I go downstairs, she always comes out of the sitting room and starts meowing at me before following me back upstairs where she will sit for ten minutes before going back down again. She never used to do this. She will also wander up to my bedroom of her on accord and meow for a few minutes before wandering off again. I'm not sure if it's because she's old now. I’ve also noticed that she will sometimes sit in corners or behind things. Any advice?