Doctors demand arrest of those involved in recent attacks on two physicians in the district
"For people aged 65 and over, it is now four months since the previous vaccine dose, and the protective effect of the vaccine diminishes over time," the Health Agency said in a statement.
Sweden had previously offered a fourth jab to people aged 80 or older.
Sweden abolished almost all restrictions in early March. It is hard to gauge the level of spread in Sweden as large-scale testing has ceased, but the number of patients requiring intensive care is the lowest in 18 months.