I Have a Theory

Since time is a human construct, then what is ageing?
What if how long we lived was determined by how we felt in the moments?
Ever had so much fun time flied. Its as if time itself has shortened.
And moments that are so dull, they seem to last for hours. Maybe its because, in a sense, they did.
That the stressful and gruesome parts of our lives take up more of our life span and the happy moments take up less.
An idea that happy, less stressed people live longer not just because of health reasons, but in how they're millions of moments are spent.