The undefined heart/will/ego center... the wisdom: there’s nothing to prove to anyone - including ourselves.
And ¿Why you think elders already gives a fuck on insisting on depleting their energy acting as though they should give more of a fuck to achieve anything?
Well, actually, it's not because they are already physically tired. But on the contrary, because they finally are aware that they finally arrived exactly where they have craved to stay their entire life.
And I'm telling you this with property. Because casually, I'm one of those elders 'at the pinnacle' who don't and won't give a shit about motivation or anything else like that anymore. :)