When I was born my father was 100% older than me
He was 40 and I was brand spanking new

In ten short years, I was 20% as old as my old man
He was 50 and I was 10

It increased to 33% when I was 20, but I was too busy to think about it

I believe I told him when he turned 80 that I was finally half his age

I wonder if I had told him that I would be 99% as old as him if he lived for 4000 years; Would that have made a difference? Would he still be here running the race?

Probably not. Who wants a kid that's the same age?