40s here - I see it a bit differently. I definitely get what you're feeling, and it's not easily fixed, but I feel very differently about the 50% of life gone.

I feel like I've had ~20 years of 'conscious adult' life, and I have at least 40 left (hopefully) - so only ~33% is gone !

Anyway, "Life is not the amount of breaths you take, it's the moments that take your breath away"