Fairfax County provides real estate tax relief and car tax relief to citizens who are either 65 or older, or permanently and totally disabled. You may be eligible for real property tax relief in most Virginia cities and counties if you are 65 years old or have a disability (regardless of age).In dollar terms, Fairfax County, Virginia residents pay quite a bit in property taxes, but this is not due to property tax rates themselves. "The car tax belongs in the trash can, not in your mailbox," Youngkin said. You may be eligible for real property tax relief in most Virginia cities and counties if you are 65 years old or have a disability (regardless of age).