Well, you said that he was consistently funny any more. What would you rather be?? Humorless? Or old AND humorless? It's a tough decision.
I think you have it backwards. He hasn't been making us laugh as often.
Long as I remember The rain been coming down. Clouds of Mystery pouring Confusion on the ground. Good men through the ages, Trying to find the sun; And I wonder, Still I wonder, Who'll stop the rain.