If you're 60 or older and live in Brookline, check your mailbox.

The town has launched one of its biggest community surveys in years, mailing questionnaires to 5,000 older residents as officials work to shape the future of aging in Brookline—and keep the town's age-friendly designation.

The survey asks about everyday issues that can make a big difference in quality of life, including housing, transportation, walkability, health services and opportunities to stay socially connected. It's available in four languages and is part of a broader community needs assessment that also includes interviews and focus groups.

Brookline's Select Board recently backed the effort by approving a letter supporting the town's renewal in the AARP Network of Age-Friendly States and Communities, which requires members to update their plans every five years.

About 13,000 Brookline residents—roughly one in five people in town—are age 60 or older, making the survey one of the largest outreach efforts focused on older adults.

Emily Williams, director of the Brookline Council on Aging, is leading the project alongside researchers from UMass Boston's Center for Social and Demographic Research on Aging.

The results will help shape Brookline's next action plan, guiding decisions on everything from safer streets and accessible housing to community programming and transportation services.

Residents will also have opportunities to learn more and share feedback in person this fall at the Brookline Farmers Market and Brookline Day on Sept. 27.

Town officials say the goal is simple: make sure Brookline remains a place where residents can continue to live safely, independently and actively as they age.