When you renew your membership, and the term will end after your 75th birthday, you'll get a membership card with "LIFE MEMBER" on it.
If you're eligible, you'll see the cost to extend your membership to your 75th birthday when you click the Renew button in the Members Area. Individual members and families with two persons are eligible.
It's important that your birthdate on the club records be correct, as otherwise you might receive a fraudulent life membership. (Birthdates can be hidden from other club members if you are sensitive.)