If you're wanting to research midlife, Social Services Abstracts is a great resource to use (linked to the right).
When developing your search strategy, it is helpful to brainstorm variations or synonyms of the key concepts you're researching. For example, based on the suggestions from your syllabus, if you are researching grandparents caring for children, you might try different combinations of the following search terms:
grandparents OR grandchildren
caregiving OR child rearing OR parenting
Remember, research is a process! If you need any help, feel free to email me at email@example.com!