Article link on travel sites with Senior discounts

As I mentioned before I really like the articles on smartertravel.com.  This article is about the best travel brands/companies to go to for senior discounts
https://www.smartertravel.com/top-websites-for-senior-travelers/?source=91&u=DED129A403&nltv=&nl_cs=51828256%3A%3A%3A%3A%3A%3A&mi_u=DED129A403

I personally have signed up for Road Scholar, but as a Canadian this article makes a lot of reco's where you need to be a member of ARRP... which in Canada is CARP,  Canadian association of retired persons.  Not sure if the deals are the same in Canada.
I find Holland America is the best cruise line for senior discounts, but it doesn't have a lot of activities like Royal Caribbean which has all ages and lots to do.
Hope this helps
Marcia