My father is turning 80 this year, and my parents, my sister, and I all live in different parts of the country. We are thinking about taking a cruise together to mark this milestone, looking at Europe in August 2020. (I know we are late on planning this.) The parties involved would be: My mom and dad, ages 80 and 78. Both of them are fairly active for their ages and don't have any mobility restrictions. They have been very anti-cruise their entire life, but last year decided to take a tour of Scandinavia on a Viking Ocean Cruise and loved it. They have two more Viking Ocean cruises booked (Western and Eastern Mediterranean). My sister and her family (she and her husband are 50, her kids will be 19 and 16). They have never cruised before. Me and my family (we are mid-40s, my kids will be ages 15 and 13). We have cruised four times on Disney, once to Europe. I'm not sure what cruise line would be best for us. My parents loved Viking. They liked the luxury and the appointments on the ship. They are very interested in lectures/learning/excursions, so Viking was a great fit for them. My family has enjoyed DCL in the past, but my kids are old enough that the characters/Disney is not a huge draw and they don't love the teen/tween activities. We are looking for a line that has interesting activities and appeals to this age group. We are kind of a nerdy bunch so good lectures are a plus, but obviously we will have teens with us. We are not looking for a "party" boat. I would consider Royal if it were just my sister and me, but I don't think it would quite be my parents' demographic. Honestly, my family has been anti-cruise for so long that I never thought we would be looking to do this as a vacation together, but it makes sense for a lot of reasons. Hoping we can find a good fit for this mix. Would appreciate thoughts or suggestions from anyone on cruise lines we should be looking into.