Translation of "Lifespan" in Japanese

Sea turtles have a long lifespan.

海がめは寿命が長い。

A qilin with a king too has no limit on its lifespan, but this illness alone admits of no remedy.

王を得た麒麟もまた寿命を持たない生き物だが、この病ばかりは治癒の方法がない。