KC-135 at the bat

Brigadier Gen. T.C. Pinckney (Ret.), in a recent Milwaukee Journal Sentinel op-ed, supported the case for a replacement for the KC-135 aerial refueling aircraft with the claim

As the delays continue, U.S. Air Force and Air National Guard units in Wisconsin are flying the same tanker planes used since the Korean War. Not the same model, the same exact planes.

Not quite, at least according to Wikipedia.

The first aircraft flew in August 1956 and the initial production Stratotanker was delivered to Castle Air Force Base, California, in June 1957. The last KC-135 was delivered to the Air Force in 1965.

Still seems old. On the other hand, the B-52 is even older. Last produced in 1962, current Air Force plans have it continuing in service until 2040.