I play "Ticket to Ride: Europe" with my kids (age 8 and 12) and I win too often. They do not want me to let them win: there's no fun in winning if you know the opponent didn't play to their full ability. We would all love a fair way to account for the difference in skills, though.

So far we experimented with reducing the number of train cars you start with: the youngest got 45, as in the rules, older got 40 and I got 35. The youngest won, but the feeling was it was too easy for him.