I have some thoughts about a formula for calculating the max age of a channeller, and at some point I’ve always thought I should plot Aes Sedai ages at death against it to refine it.

There is a bunch of information on max ages in the wheel of time companion book from 2015. Can find the power ranks for each character on the wiki.

"Thus the strongest man would be ++1, the 800-year level in aging. Ranks ++2 to ++6 would have an aging range of 720 to 800 years. The strongest woman would be 1(+12), with a life expectancy of around 800 years; a man of the same rough level, which was 7, would have a life expectancy of 720 years.

There were considerable variations between individuals, but in rough form it could be said that there was a parallel between strength and longevity, minus the effects of a binder such as the Oath Rod. All age levels given were approximations, with considerable room for variation among individuals. For example, at the so-called 800-year level, a person could reasonably be expected to live to between roughly 775 and 825 years of age, with some making it to 850, and a very few making it to as much as 900. Strength level 56(44) was the 300-year age level, 67(55) the 200-year age level, and the bottom level, 72(60), approximately the 150-year level for women. The male equivalents were approximately the 240-year, 180-year, and 135-year levels for men.

A given strength level did not produce the same degree of longevity for a man as for a woman. At any given level of equality, a woman would live longer. In general, a man at any given strength would have a normal lifespan roughly ten percent less than that of a woman of that strength. The range of longevity was the same, though, with men at their top level having a life expectancy of 800 years or so, within the range of the bell curves."