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Surprisingly, the longest-lived housecat on record lived 38 years [1]. Much longer than you'd expect given that an average lifespan is just 12-15 years.

[1] https://en.wikipedia.org/wiki/Creme_Puff_%28cat%29

I could be totally incorrect about this theory, but I thought that's why we get wisdom teeth around that mark, since we would be essentially without teeth at that point in our life if we had went a lifetime without brushing.

I know tons of people under 30 who have a lot of cavities.

Sure but the can smash up food well enough to live.