Answer

100 years

I'm fifteen for a moment

(Caught) in between (ten) and (twenty)

And I'm just (dreaming)

(Counting) the ways to where you are

I'm twenty two for a moment

She feels better than ever

And we're (on) (fire)

Making our way back from (Mars)

Fifteen there's still time for you

Time to (buy) and time to (lose)

Fifteen, there's never a wish (better) than this

When you only got hundred years to live

I'm thirty three for a moment

Still the man, but you see I'm (of) (age)

A (kid) on the way

A family on my (mind)

I'm forty five for a moment

The sea is (high)

And I'm (heading) into a (crisis)

(Chasing) the years of my life

Fifteen there's still time for you

Time to (buy), time to (lose) yourself

Within a (morning) star

Fifteen I'm (all) (right) with you

Fifteen, there's never a wish (better) than this

When you only got hundred years to live

Half time goes by

Suddenly you're (wise)

Another (blink) of an (eye)

Sixty seven is (gone)

The sun is getting (high)

We're moving on

I'm ninety nine for a moment

(Dying) for just another moment

And I'm just (dreaming)

(Counting) the ways to where you are

Fifteen there's still time for you

Twenty two I feel her too

Thirty three you're on your way

Every day's a new day

Fifteen there's still time for you

Time to (buy) and time to (choose)

Hey fifteen, there's never a wish (better) than this

When you only got hundred years to live