AARP stands for the American Association of Retired Persons, however that may be a little misleading since you can join the organization at age 50, and many people who us their advice and services are neither members nor retired.
There are more than 35 million members, and the official magazine often has articles regarding the best places to retire. Speaking of which we get questions on this forum from people of all ages about the safety of traveling in or to Mexico.
An article appeared in AARP Magazine, that was very illuminating about the point of Mexico safety in general, and American's being in / living in Mexico specifically. While the thrust of article is about retiring, it actually covers many of the things that get asked here.
I've linked it below, prefaced by a few quotes most germane to this forum:
"Mexico is the undisputed number one destination for American retirees."
"Mexico, however, is also nearly three times the size of Texas, and most of the country is reasonably safe and secure, especially resort areas and tourist destinations."
"The one thing expats most appreciate about life here: the traditional Mexican friendliness."