I am over 60 and fly occasionally to USA. No problem. Age 65 is now the ICAO limit. Our airline rule is that only one pilot can be over age 60 on that flight crew. Funny thing, I recently had to give a line check to a captain who was also over 60, but we could not fly together, so we just added a younger F/O, and I "supposedly" occupied the jump seat...
only problem, is to store the wheel chairs for us captains over 60...
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Used to be that the FAA had a limitation for 60 age pilots on foreign carriers (foreign carriers certified to fly in USA are certificated and subject to FAR 129), but they abandoned that rule a few years ago.
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There is still a restrictions though... If a foreign airline leases an airplane under US registry ("N") and the pilots fly that airplane and are holder of a "FAR 61 issued" special purpose certificate for airplanes leased to a non-US citizen", they still have an age 60 limit. I understand that rule will be changed in the near future.
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Happy contrails