Witches and Wizards seem to be able to prolong their lives far past the natural life expectancies of muggles, while maintaining the fitness and activity levels of far younger muggles. Aside from Nicholas Flamel though, the ages of ancient witches and wizards are mostly discussed in non book sources.

For example, Dumbledore was said by Rowling in an interview from the early 2000s to be around 150 or so, a number later revised down to 116 at time of death. Using either age shows a competent and capable wizard working well past their 100th birthday and showing no signs of slowing down. Bathilda Bagshot is ambiguously older than Dumbledore, and several of his age contemporaries such as Elphias Doge and Grindelwald are still alive.

More tenuously, Armando Dippet is said to be over 300 years old in a Daily Prophet article from the CoS movie. This is our main evidence that wizards can live for centuries plural (presumably) without magical aid from alchemy or horcruxes. Dippet also makes Voldemort's final death in his 70s laughable.

Now to get into headcanon, what do you think gives a witch or wizard an extended lifespan? Is it simply the fact that healthcare is immeasurably better in the Wizarding world, rendering the leading causes of mortality for muggles impotent? Is there some intrinsic biological difference? Does latent or accidental magic work to subtly prolong the lives of its users? Or are the above examples merely edgecases? Also, do you consider Dippet's incredibly long life to be canon, and if so, what, if anything distinguishes him from his peers?

There are definitely questions to be asked about wealth concentration and generational wealth in the wizarding world if lifespans are greatly increased (The Malfoys must kill off ancestors with regularity for young Lucius to be in full control of the family fortune), but perhaps those questions should be saved for another thread.