There are multiple paths to saving for retirement.Most are at least peripherally aware of the more common retirement income streams of social security and employer-sponsored retirement accounts.
My grandparents moved around a lot throughout their younger years, first because my grandpa was in the Navy and later because of his career. They bought and sold multiple houses, but all the specifics were handled by the company.
My grandparents purchased the Boring house for $360,000 in 2005 and paid cash, which meant they were able to pocket around $65,000 to supplement their retirement.