Reading Keats as an Undergraduate

I remember reading Keats as an undergraduate
Impatiently waiting for that Tuesday morning class to end
So I could get breakfast
But I wish I paid more attention
Because now
The unheard melodies are even sweeter
As I turn 40
The fair youths in my class were bored like me
But the secret was right there!
I have watched the branches drop leaves 20 times
And each time I become a little sadder
Those are not the boughs of my youth
I have listened, tried to stay
Tried to kiss those frozen maidens
Who now have kids and mortgages
I should have tried to kiss them knowing I would come ever close but
Not reach the goal
It would be better
Than getting up in the morning for work