Use the PSEA-Retired home page link for details on joining PSEA-Retired.  

https://www.psea.org/resources-by-profession/psea-retired/

We encourage you to purchase a lifetime membership and have made it convenient to do so in either a reasonable one-time payment or payment options.  We encourage veteran members and new ones to make time to become involved.

Taking advantage of Member Benefits can easily allow you to recoup your membership fees.  

https://www.psea.org/for-members/member-resources2/member-benefits/