Many websites offer discounts for senior citizen travel. I would recommend http://www.priceline.com http://www.expedia.com or http://www.orbitz.com You could also try calling the hotels and airlines directly and asking for a senior citizen discount.
Many travel agencies offer discount travel for seniors. For some online examples you can visit www.cheapflights.com/travel-tips/senior-discounts/ or www.bargaintravel.com/senior_travel.html
When it comes to discounts on food, movies, and travel seniors do have an advantage in that area. Here is a site that has some travel info for seniors: www.onetravel.com/travel/senior-travel-deals.asp
The price of travel insurance depends on the price of your trip and what coverage you want. Here is one place that specializes in insurance for senior citizens: http://www.portwood.co.uk/travel-insurance/online-quotation-system.htm
Looking to get senior travel insurance? There are quite a few options out there for seniors who love travel. Travel insurance is one of the most important things to think about (and have) before you set off on your trip. Seniors are more likely to encounter some sort of problem abroad and thus require special insurance to provide the coverage they need http://seniorstravelinsurance.org/
Possibly farmersinsurance.com or travelersinsurance.com. I had a relative that did some traveling last summer to south America. She got a better rate because she was a senior citizen. More often than not most reputable insurance companies have cheaper policies for seniors
There are many insurance providers that sell affordable insurance to seniors. For some examples you can purchase online please visit www.travelinsurance-quotes.com/
Travel insurance can be found through many insurance companies. If you are flying, some airline companies also provide insurance. To get the best rates, use this online site to determine the best company http://www.worldtravelcenter.com/
There are many airlines which offer seniors only travel arrangements. For some ideas you can visit www.bargaintravel.com/senior_travel.html or www.smartertravel.com
There may be some charities that provide these to seniors in need.
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
To find cheap travel, look for package deals, such as a theme park package that would include park and hotel accommodations. You can ask if you can use flyer miles, go off season, when rates are more reasonable. Ask if they have special rates for seniors, or a manager's special for example. Compare rates through a travel agency or through searching online.
Expedia can offer advice for helping senior travelers. Also the AARP can assist you in looking into travel options and travel destinations. Brazil is a very hot location, so keep that in mind as some seniors are very heat sensitive.