I mean no disrespect to your post, however I think you are limiting yourself by putting on your age limit. I have met many great people that are older then I am, and that is older then you, that many younger people could not keep up with. I have made some great friends because I was willing to spend time with people of all ages. I also have spent many time on very active excursions with older people.
I hope you have a great time on your Alaska cruise. I have done them many times and will be back there in a very short time but on a different ship.
Please don't give up on people that are older then you, you could be missing out on a lot of good times.