Certain ages come with important financial milestones, and knowing when they occur can help you avoid costly mistakes as you prepare for retirement. We walk through key retirement ages, including catch-up contributions at 50, the Rule of 55, penalty-free withdrawals at 59½, Social Security eligibility at 62, and Medicare at 65. We also discuss delaying Social Security benefits, required minimum distributions, and how understanding these milestones can help you make more informed decisions about your retirement income and taxes.