You will not stay alone. The San Francisco Retirees 65+ community is already waiting.

A dedicated lane for Retirees 65+. Light-exercise groups are the recurring subject, and Sunset District plus Potrero Hill anchor most of the real-world meetups.
Group vibe
Independent, businesslike, still glad to have you.
Example members. Real archetypes drawn from the people who already meet up here.
From Sydney
Retired teacher, 3 years in Sunset District
From Munich
Retired doctor, volunteer at local clinic
From London
Widow, gardener, Hayes Valley expat
From Seoul
Retired banker, golf enthusiast
One number to sign up. Your group is already waiting on the other side.
Join Retirees 65+