Why?

Where were you when I was seventeen?
When I was treating 'em mean, keeping 'em keen?
Where were you when I was twenty-one?
When my days and nights were spent having fun?
Where were you when I was twenty five?
When I was filled with the joy of being alive?
Why did the angels take their own sweet time?
So that you weren't here when I was in my prime?
Why when I look at you, do I feel such an ache?
Or that you're on my mind each morning I wake.
And why has this feeling remained to this day
Even though youth has gone, I still love you this way?
Why, Rob, why?