I can see that well.

His garrulity is the garrulity of old age in its last flickering moments.

He mumbles and mutters.
He chuckles to himself.

If you don't hear his message now and at once, it's my solemn conviction you will never hear it." He led them out to the aviary, where Methuselah, in effect, was sitting on his perch, most tremulous and woebegone.

His feathers shuddered visibly; he could no longer preen himself.