Two things: - after you reproduce evolutionary pressures have way less leverage and are limited to how an individual effects the copies of their genes that sti

Two things: - after you reproduce evolutionary pressures have way less leverage and are limited to how an individual effects the copies of their genes that still might reproduce - excess longevity will result in an older nonreproducing individual competing with copies of its genes leading to evolutionary pressure to die when below a threshold of usefulness to younger generations of your genes