Retirement plans are typically available to individuals who meet certain eligibility criteria. Eligible individuals often include employees of companies that offer retirement benefits, self-employed individuals, and individuals with earned income. Additionally, some retirement plans may have specific eligibility requirements based on factors such as age, years of service, and employment status. It's important to note that eligibility criteria can vary depending on the type of retirement plan, such as 401(k), IRA, pension plans, and government-sponsored plans like Social Security. For specific details about eligibility for a retirement plan, individuals are encouraged to consult with a financial advisor or the plan administrator for comprehensive guidance tailored to their unique circumstances.