I think the average age can vary a lot by cruise line.   Our first river cruise was a Dunube cruise on Vantage in 2005. My parents had done a number of river cruises prior. This was something my parents wanted to do with us. There were 6 of us, my parents, me, my wife, my sister, and her husband. My parents were in their 60's the rest of us in our mid 30's. My parent's were probably on the younger side, and the 4 of us "kids" would have been the youngest on the cruise ship (other than
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