My poor cat has wobbled on her legs recently ... what to do?

[bonhomme]

My cat is about twelve years old and over the last few weeks, I have twice seen her lose her back legs for a few seconds - she seems to go sideways and her back end slopes but then soon recovers. It's happened now on the carpet and on the wooden floor.

Is this just old age and to be expected or does she need to go to the vets? WWYD?

Twelve isn't so old these days. I would take her to the vet and see if they can find out what's wrong.

12 is now just considered older, cats are not geriatric till 15. There is loads that can be done for wobbly back legs which can be due to several different things.
A good vet check will be well worth it.