Menopause usually starts around 51 but there is a lot of variability and around 1 percent of women experience menopause before age 40. So it's not a direct result of cell damage. Now, if your suggesting that it's an evolutionary response to cell damage that's possible however as fixing the damage would not remove that response the difference is somewhat meaningless.

Changes in brain chemistry are another thing that's probably not directly damage related as the declines start around mid 20's.

PS: Biology has a lot of odd edge cases, youngest mother is 5 oldest 74. http://en.wikipedia.org/wiki/List_of_youngest_birth_mothers

http://en.wikipedia.org/wiki/Pregnancy_over_age_50