From “The Inertia Variations” by John Tottenham:

There was a time when I thought
I might have done something by now;
But that was long ago, and over the intervening
Decades I have shifted from prodigy to late-bloomer
To non-bloomer; I have passed my peak without having peaked
Or even begun the ascent, and unless there is something inherently
Salutary to the energy I expend in frustrating myself then
My sacrifices have all been in vain.