Has anyone ever taken lifelong meticulous care of their teeth? What does that even look like?

Random shower thought today; systemic healthcare support and social emphasis on caring for one's own health have exponentially increased in the last 100 years. So do we really know what it looks like if an ~80+yr old patient brushed/flossed daily, and kept up on routine cleanings? Do their teeth just not fall out with age?

If you've had patients like this, let me know! The curiosity is killing me lol.