Tired of lying in the sunshine, staying home to watch the rain

You are young and life is long and there is time to kill today

And then one day you find ten years have got behind you

No one told you when to run, you missed the starting gun!

And you run and you run to catch up with the sun, but it's sinking

And racing around to come up behind you again

The sun is the same in the relative way, but you're older

 shorter of breath and one day closer to death.