When President Lyndon B. Johnson signed Medicare into law on July 30, 1965, did my 5-year-old self truly comprehend the personal milestone that I would someday reach? Nah. My 5-year-old self couldn’t comprehend that Christmas 1965 would ever arrive, let alone that I would someday have my own brand spanking new Medicare card. It’s right here in my wallet. I really should have it laminated. The sa…