I think that depends on your definition of "life".
Plants, animals (not including humans), even fungal species and eukaryotic organisms. All of those are living things.
But it sounds like you're referring to the life of a sapient creature. From an evolutionary perspective, you could argue that our minds and our sapience is nothing more than the complex "upgrades" from non-sapient creatures. Like a dog. It has senses an can think for itself. But can it understand rationality, or reason on a basic level? As far as we can tell, it can't, so it isn't sapient.
Back to the complexity, it would seem that all of our senses and our nervous system are just electrical and chemical signals flowing through our nerves. Back to dogs, their nervous system works in the same way. But through our evolution, our nervous system has changed so much that we can reason, and have rationality, in a sense. Because of that, from the beginning of mankind, we didn't understand how this worked, so we just assumed that we were special, that we were completely separate from the other animals.
But are we? If all of this is true or at least close even a little, it would seem the soul doesn't exist. So what is the value of life then? Or how about the meaning or purpose of life? I don't think life has any inherent meaning or purpose. We ourselves define the two, simply because we can.
I've suffered from depression before, but after losing my faith in God, I didn't really feel this way, after coming to grips with it, because of the above. It doesn't matter. There is no meaning of life, except what we design for ourselves.
Of course, I could just be spouting bullshit and talking out my ass.