“[A] recent study compared the lifespans of 286 sopranos, altos, and mezzo-sopranos (the latter two were combined into one unit), born between 1850 and 1930. … [C]ontrolling for birth year (people born in 1850 were at a disadvantage!), sopranos lived about five years longer than the lower-voiced female singers.” The key? Higher estrogen levels, apparently.