If you go to the OLLU website at https://library.ollusa.edu and go to the left side of the page, you will see a link for article databases. Click on it and from the list find the database SocIndex. When you log into SocIndex you will see the main search screen. In the search fields, enter the cuban or mexican and elders OR older people OR seniors
(See the attached image for an example)
Then try the same search in the databases Social Work Abstracts and Academic Search Complete. That should give you a good start on finding the literature.