I am reading contradictory info on different Italy sites regarding discounts for young people to museums, etc.. I just read 18 - 25 year olds can get discounted entry (not specifying where they are from) and other sites state discounts are just for Europeans.
We are traveling with an 18 year old.
Also, when we bought Colosseum tickets online they did not even ask for age, price was 14 euro (12entry plus 2 fee) each.