I personally find the US setup where often the longest serving and oldest workers would be earning the most, strange. Even when those oldest folks are clearly past their prime and themselves admit so.
There are always exceptions. I worked with a fantastic colleague who was a highly knowledgeable technical expert and a capable PM, always punching above his weight at work. One day in a chance conversation with him I was shocked to hear that he wants to retire soon because, now that he is on the wrong side of 90, he is not that interested anymore. My jaw dropped -- I never paid attention to his age. But I suspect many folks in the last quarter of their productive life will be happy to slow down. My 2c.