You actually start dying the moment you're born.
I hate hearing people say this. It's totally absurd. You're telling me that as I physically
grow, and emotionally and spiritually evolve, I'm actually
losing my "life-force"? When a tree is a seed, and that seed sprouts, and that sprout eventually produces leaves, and that little thing grows and grows and grows, and reaches for the heavens, is it "dying" the whole time it's
growing? I don't think so.
To add a philosophical/physics-based element to all that, one could say that life is energy, and energy is neither created nor destroyed, so in theory, death is just a fallacy.
But still, even without all that, assuming we're all just physical entities, physical entities don't start "dying" until the parts and pieces needed to support the rest of the body start to fail.