(Wall Street Journal) – Human lifespan has a limit and we might have reached it. S. Jay Olshansky, who studies the upper bounds of human longevity at the University of Illinois Chicago, believes people shouldn’t expect to live to 100. Most, he contends, will reach between 65-90.

Biology is holding us back, Olshansky said. Human evolution favors growth and reproduction, not living to excessive ages. As people grow older, their cells and tissues accumulate damage. Breakdowns of one kind or another happen more frequently and get increasingly difficult to repair. Scientists believe there are likely many genes that affect lifespan. Aging is a complex process that isn’t well-understood. (Read More)