Effects of surgeon's age on the surgery

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Surgeon's skill is said to be affected by his/her age.
Do you think that matters?
Especially, some of the most famous LL surgeons are already sixty or older.
How will it likely affect the surgery result?

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I thought CLL is one of the hardest surgeries so only few surgeons do this. I heard this surgery is hard and takes lots of hours like 4+hr, demanding tough physical and mental abilities from surgeons.

Speaking of age, i remember Dr.Paley is around +70 yo. He's obviously best surgeon but wouldn't you have any worries if you do it with him?