Only a Child Can Do It.

 Practically everyone over fifty hated the old math and does it poorly and inaccurately without a calculator.  Because of the way they learned it they are incapable of learning the New Math. ( A whole class of Stanford Seniors learning New Math for a teaching credential, failed a 4th grade review quiz on a midterm.) If you didn’t learn the new math in grade school ferggettaboutit.  You can’t even discuss it intelligently.