how long should inner tie rods last on 2007 Toyota Avalon? on 2007 Toyota Avalon

mechanic said both inner tie rods need replaced, I said car only 5 years old seems should last longer than that and was I going to have to have them replaced every five years, he said because Avalon a heavy car puts extra stress on tie rods

Asked by for the 2007 Toyota Avalon
5-7 years or so
thank you!