We have been fortunate. Our previous rescue Golden (adopted at 7) lived to 14. And then it was a matter of her hips and back legs wearing out due to arthritis. When it got to the point it became very very difficult for her to get up and to walk we had to have her put down.
Now have a 10 yr old rescue Golden (adopted at 6) who is still in great health, although starting to slow down a little on long walks. Hopefully she will be around for another number of years.
Although both had to have multiple cysts removed at different times, neither ever developed cancer.