Dear Rusty: I'm turning 95 this year and am caretaker for my wife in our 70th year of marriage. I served before 1968 (195153) during the Korean War. How do the “special extra credits for military service” work for me? Is it retro-active? My wife, who only worked a short time, gets half of my Social Security so would it affect hers, too? Signed: Korean War Veteran Dear War Veteran: First, I want…