The Numbers Guy

Seeking a Survivor for a Lifetime Appointment

Updated Feb. 17, 2013 12:20 p.m. ET

Lifetimes, and lifetime positions of power, are an increasingly gray area.

In a surprise, Pope Benedict XVI resigned this week, citing his age and diminished physical and mental strength. He became pope in 2005, at age 78, and is stepping down shortly before his 86th birthday.

His move spotlights how increasing lifespans, the growing...

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