I vanish when you try to hold me, yet shape every life. I can be borrowed, but not owned. I can be measured, yet never seen. What am I?

You can buy me, or make me, but you can never get more of me; You can kill me, but you'll still die while I continue on; What am I?

I am an odd number, and in my prime. But, most of me is even.

I am always ahead but never seen, I'm promised to all,yet belong to none You can chase me but never reach me, For once I arrive, I am already gone

All people hate when you tip me If I answer what's wrong then you doubt me I'm the one thing that will last forever If you know me you can't be that clever