Loading Common data from Instagram. Please wait... @common : "Our lives begin to end the day we become silent about things that matter" Dr. Martin Luther King Jr. On this day 51 years ago, Dr. King was assassinated at the age of 39 years old. This is an excerpt from his final speech 'I've Been To The Mountaintop" that he delivered the night before at Mason Temple in Memphis. RP via @ARRAYNow.