The optimal window to purchase long-term care insurance is generally between ages 50 and 65. During this period, most people still qualify medically, premiums are significantly lower than in later decades, and retirement planning is close enough to be realistic. Waiting until older ages or after developing health issues often results in steep premiums or an outright decline. Buying very early locks in low premiums but extends the period you pay before benefits are likely needed — a trade-off worth modeling with a financial planner.