life is something that is capable of evolution -- changes in the composition of hereditary traits, and changes to the frequency of their distributions within breeding populations from generation to generation, in response to ecological challenges and opportunities
Maybe change "breeding" to "reproducing" otherwise it would exclude non-sexual populations. But other than that I think that definition fits rather well.
and this approach raises interesting questions in defining when life occurs
This definition could only apply on a population basis, since a organism could be born sterile and incapable of reproduction, and therefore, as an individual, not part of the breeding or reproducing population but still be considered alive.
and what we view as life.
Yea, defining life is kind of like defining species; we intuitively know what it means but to create a one-size-fits-all definition is rather elusive.
Do you consider viruses to be alive?
HBD
Whoever calls me ignorant shares my own opinion. Sorrowfully and tacitly I recognize my ignorance, when I consider how much I lack of what my mind in its craving for knowledge is sighing for... I console myself with the consideration that this belongs to our common nature. - Francesco Petrarca
"Nothing is easier than to persuade people who want to be persuaded and already believe." - another Petrarca gem.
Ignorance is a most formidable opponent rivaled only by arrogance; but when the two join forces, one is all but invincible.