BAJA was formed in 1998 and currently has approximately 350 active members who regularly participate in club-sponsored senior sports activities (including softball, golf, and bowling) plus engage in fundraising and volunteer efforts to assist local charities and civic activities.

Membership is open to all persons age fifty (50) and over, male and female, who reside in the general area near Green Valley, Arizona. The Clubs geographic territory extends along the I-19 corridor from Sahuarita to Nogales, including Green Valley, Amado, Ron Rico, and contiguous areas. All memberships include a spouse or significant other living with the member.