Physical, but not mental. In a letter to a friend a few years before his death, Huxley took note of his infirmity, then wrote: "But for all that, the cosmos remains always beautiful and profoundly interesting in every corner -- and if I had as many lives as a cat I would leave no corner unexplored."
As part of his obituary, the British journal Punch penned this epitaph:
The great Agnostic, clear, brave, true,Every time I see a picture of Huxley in later life, I am reminded of our own E. O. Wilson, another champion of secular, liberal, scientific values.
Taught more things may be, than he deemed he knew.