One of 105 parliamentarians appointed to the Senate by the Governor General on the recommendation of the Prime Minister. Senators must be at least 30 years of age, reside in the province for which they have been summoned, and have real and personal property worth $4,000, in excess of any debts and liabilities. Unless they die, resign, are disqualified, or their seat is declared vacant, Senators hold office until they retire at age 75. Senators examine and revise legislation, investigate national issues and represent regional, provincial and minority interests. Senators also introduce their own bills and sit on committees in order to examine specific social and economic issues in detail.