Basically, if you outlive the duration of your term life policy, you'll get back most of the premiums you paid for your life insurance.
You can use the money as you choose, supplement your income at retirement, send your children to college, pay for personal expenses or for something else you would like.
So, if you outlive your return premium term life insurance policy period, you end up with more money in your pocket, paying a lot less for the coverage you didn't end up using.