Math. Math my dear boy is nothing more than the lesbian sister of biology.
Intrigued that Benedict is retiring. Maybe the Mormons'll notice.
Modern medical advances increasingly make lifetime appointments fade into leaders struggling to serve after they're able, but at least the Supreme Court and Pope can be selected from younger candidates. The Mormon automatic selection of whoever has the most seniority of the Council of Twelve statistically games the system toward geriatric woes.
There was speculation that they've tried to avert disaster by promoting a few youthful (50ish) leaders; problem is that eventually everyone gets old. Stacking the deck toward 'young seniority' merely delays the inevitable. Nudging Apostles to retire is an easy fix.