Idioms: Days are Numbered

Somebody's/something's days are numbered - if someone's or something's days are numbered, they will not exist for much longer.

 

Example:

1. As our local cinema struggles to survive, it seems clear that its days are numbered.
2. I know my car's days are numbered, but I hope it will last just a little while longer.
3. My days are numbered, but I hope I can live long enough to see my grandchild.

Courtesy: days are numbered - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia