not getting any younger
Getting older each day; running out of time or ability to do everything a young person can do. I decided to move home. My brother needs constant care since his accident, and my parents aren't getting any younger. I used to be able to do that hike in the morning and still have energy for an evening run—I'm not getting any younger, that's for sure!
not be getting any ˈyounger
(spoken) be getting older: I can’t possibly walk all the way to the beach — I’m not getting any younger, you know.