Pursuant to Little Hawk's comment, a small and half-witted parody of Over the Hills and Far Away seems fitting:

Over the Hill and All Washed Up

For the sake of pride and prospering
Rocky plans a comeback in the ring
He's forgot that "he who runs away
Lives on to fight another day."

CHORUS: O'er the Hill and All Washed Up,
Please to throw a penny in the cup
For the angel band is tuning up
"Over the Hill and All Washed Up."

He will fight the Mason-Dixon Lion
Our disbelief and his age defyin'
His wits he must have thown away
If he's going back into the fray.

(chorus)

So I'm taking up a collec-ti-on
To subvert natu-ral selec-ti-on
Please pitch your coppers in to save
This has-been from an earthen grave.

(chorus)

If I can but raise a paltry sum
We'll avoid an obvious and sad outcome,
And a bonus we'll accrue, what's more:
One less bad film and tedious score.

(chorus)

But if he should fight in the ring once more,
He may fall as others have before --
Then the angel band may indeed strike up,
"Over the hills and All Washed Up."

LAST CHORUS: O'er the Hill and All Washed Up,
And as the daisies he pushes up
Hear the movie-goers in cheers erupt:
"He's Over the Hill and All Washed Up."