Wow sounds like an incredible cruise.  I've never done the river cruise but the better half and I have done over a dozen ocean cruises.  We did 3  in the past year celebrating our 40 th anniversary in 2017.   You are indeed right, but I just took a little too much verbal abuse from the jerk.  In a lot of ways I felt really sorry for the guy as he is extremely intelligent.   Sad to see an intelligent mind reduced to being an 18 hour troll every day.  But I'll take your advice and ignore him.   You are indeed right about not slowing down as I turn 69 in January of 2018.   I have been given the opportunity of giving some lectures out at U.B.C. my old alumni.   So you and I are like a fine wine, just getting better with age.   Take care buddy and God bless you and your family.