Doorstop. He-heh. I’m optimistic as to my ability to retain at LEAST that much “Residual Functionality” for the foreseeable future.
More generally, I observe that aging becomes an ongoing effort to successfully retain the highest level of Residual Functionality through acquisition of alternate, and transformation of existing functionality.
So, mathematically, death may be expressed as the limit life as Residual Functionality approaches zero?
I took my last math course in 1986. I suppose that, no matter what other abilities I lose, I can still manage Napping with Babies and Catz.
Residual functionality equates to the Peter Prinicple? Kewl!
I don’t need to worry then. ;o]
That's one definition. It is not necessary to assume that functionality must decrease, even if it is assumed that it must change.
As example; Stephen Hawking has very little physical functionality, but he has found ways to augment his mental functionality.
So too, it may be possible that otherwise apparently minimally functional individuals may be functioning in a manner that we have no means to observe.
The end limit of this possibility is unknown.