Proverbially Jocund

We're just two kids getting along,
So young, so vibrant and innocent.
We're just like free birds
Up high in the forest trees,
Chasing each other, playing tag,
Being the proverbial jocund.
A famous singer once sang
That it seemed to him a crime
That we should age.
It's so hard to fathom our own mortality
At our age, that of the proverbially jocund,
But alas, even we must be reined in
By the truth, sacrificing our luminosity.
I suppose it is best to shine longest
As opposed to being a shooting star,
But I will always look back fondly
At the age when we were free spirits.