Yes senior travel groups are available. You can visit http://seniortravel.about.com/od/tourgroups/Senior_Travel_Tour_Groups.htm for destination information.
SeniorTravelGroups.com offers a very good list of the various senior travel groups and Adventures Abroad offers many resources and guides for senior travelers on their website as well.
You can find information on single senior cruises for your grandmother by seeking travel agents who specialize in senior vacation packages. Very few general travel agents or online booking sites offer this service.
Depending on the senior travel club that you would to join, contact them and see what benefits and special details are that they have for single senior travel. All companies will be different so be sure to contact them and find out their information.
There are many packages and discounts offered for the seniors not only food and movies but airfare, etc. Here is more information on senior travel: www.transitionsabroad.com/listings/travel/senior/KeyWebSites
There are some great senior travel clubs out there. To help find the one that interests you most check out www.sunstoneinteractive.com/.../senior.../single-senior-travel-clubs/.
There are a couple of options for single senior vacations. You could travel alone or you could get involved in some tour groups that cater to senior's. A good place to start your research is http://seniortravel.about.com/
There are several places that are devoted into giving seniors the cheapest tickets while still attaining quality. One place that you should definitely visit is www.grandparents.com/gp/topics/single-senior-travel-groups.html
Check out different travel agencies for information on senior travel. If you can't find the best information then contact a local senior home and ask them if there's any good information they can tell you about senior travel.
You can go through popular travel sites such as Travelocity.com for information on senior travels. Most of these websites offer packages that will cater to all different age groups.
My grandfather wants to go on a travel tour for senior citizens but really doesn't know where to look for information. Where can we find information on senior citizen travel tours?
One can find more information about senior travel on various places across the world wide web such as the Senior Living website and Senior Travel on About Dot Com.