Maybe it depends on what type of Khajiit it is.
That may be so, since they range in size from housecats (but don't call them that) to great beasts of war and burden.
I'd suspect their natural lifespan to be long compared to Men (and longer than the related Bosmer, who are a mongrel race). However, Elsweyr is a harsh land, and many die of other than natural causes.