Seniors looking to shave $500 off their property tax bills can apply for the senior tax abatement program. Dot Sullivan, who organizes the program, said 24 positions will be available this year, up from 12 last year. So far, almost 50 people have applied, Sullivan said. Those selected from a lottery must commit to work three hours a week from Nov. 1 to March 1 at places around town, including the schools, Town Hall, or the Turner Free Library. To be eligible for the program, residents must be 60 years or older and be taxpayers or married to a taxpayer. Applications are available at the James M. Hurley Senior and Veterans Center, 15 Fencourt Ave., and are due Sept. 27. A lottery to pick the names will be held Oct. 1 at 11 a.m. at the senior center. For more information, call Sullivan at 781-963-4466.