The best time to purchase long term care insurance is typically when you are in your 50s or early 60s. At this age, you are likely to be in good health, which makes it easier to qualify for coverage. Additionally, purchasing the insurance at this stage in life allows you to lock in lower premium rates before you reach an age where the cost of coverage increases significantly. However, it's important to consider your personal financial situation, health status, and family history when deciding when to buy long term care insurance. Consulting with an insurance professional can help you determine the most appropriate time for your specific needs.