GrandmaB - I'm retired several times over and well into my 60's and began cruising when I was only 9 - I have never had any sort of an age problem with cruising nor have I ever seen one! In Feb 2010 I'm taking my mom (93) by sea and air on a cruise!! She's ready and rarin'to go!! Needless to say - she's never had nor seen an age problem on a cruise!!
Mom's first cruise was back in 1926!!!