The best sources of retirement income typically include: - Social Security, which forms a fundamental part of many retirees' income. - Defined Benefit Plans, which provide a predetermined monthly income. - Defined Contribution Plans, like 401(k)s, which depend on the contributions and investment choices. - Home Equity, which can be utilized through selling or renting. - Reverse Mortgages, allowing homeowners to convert part of their home equity into cash.