I'm a few years younger than Prince Philip, but I still find I can be quite grumpy on occasion, and look grumpy on even more occasions, even when I'm maybe feeling quite affable. It happens to all of us as we get weathered by time.

I suppose he could get his face bottoxed into a permanent grin. But I don't imagine that would make his critics any less hostile.

I suppose the next big royal event will be his funeral. I can't see that shutting the critics down.