Contacts for Senior Citizens “Aging” office for San Bernardino County Phone: 909-891-3900 or 1-800-510-2020 To learn about resources and government aging programs. Aging Office for San Bernardino HICAP Medicare Counselors in San Bernardino County.Phone:916-376-8915 or 1-800-434-0222. This office is much easier to call than Medicare because it is local, most people. Strongly prefer calling their …