Someone who can no longer produce children is still clearly alive and therefore does indeed subscribe to perhaps an alternate definition for the word life, be it through a sterilization process or just plain old age.................
May be one can not adjudge an unknown individual as alive, if we can not
communicate with it, it shows no sign of reproduction, and does not
consume food , It would have to be a community of (aliens)
we study, if they did none of the above it would be difficult to
call them alive.
A born optomist