Young and old

One day, I spoke to young and asked her who she thought she was,
And young spoke up with boldness of her plans to change the world.

And then I turned to old and asked her who she thought she was,
And old replied with gladness of  what once, back then, had been.

And then I saw how old had taken young upon her knee
To say that old is what all young - with luck - will one day be.