Your alignment guy's head is out. Get a second opinion. My bet is on suspension bushes/knuckles, wear in the front axle/wheel bearings. The reason I say this is because you have had this car for 15 years and earlier you did not have uneven tire wear issue and also you have not been in a major accident plus the chassis is not completely rust eaten..... So how can the chassis be out of alignment????
BTW inner tire wear usually indicates excessive toe out.