SIR (Sons in Retirement) is a nonprofit public benefit corporation for retired men, devoted to the promotion of independence and dignity of retirement. SIR's purpose is to assist men in renewing former friendships and provide opportunities to make new friends through association with other retirees. The only requirement for membership is that a man be retired. Membership is open to men retired from FULL-TIME gainful occupation, regardless of age, race, color or religion. We, your fellow retired men from nearly all professions including business, science, engineering, legal, medicine, and education, invite all who meet these criteria to consider joining SIR.

Founded in 1958 for the strict enjoyment of retired men, the SIR organization has grown to over 180 branches with more than 25,000 members in Northern California. There are no initiation fees. In lieu of dues, an opportunity to contribute to the expenses of the branch is encouraged. Volunteers man all office and administrative positions from the statewide organization down through the Region, Area, and the local Branches. The SIR organization exists strictly for the enjoyment and dignity of retired men.