As mentioned, whole life insurance policies are permanent, meaning they don't expire after a certain period of time as long as the premiums are paid on time and in full. (lifeinsurance.org)
That means they're designed to last your entire life and won't expire after a certain period of time as long as required premiums are paid. (protective.com)
A convertible term life insurance policy allows you to convert to a permanent life insurance policy after a certain period of time. (quickquote.com)