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I think the most impressive thing is the doctor still being around after 40 years of profession!

I don't think OP is mentioning the same doctor 40 years later. They mention "such" doctor:

"ast forward to today, and 40 years later such doctor called him and said"

no, it was in fact the same doctor, he is really old now, that said it wasn't the same one who ended up performing the surgery

Even if he didn't do the surgery, he has a superior context window.

Must have survived a lot of compactions

yeah our family was actually quite happy he called in to follow up, I thought that was the most beautiful thing