The Friendship Calculation: Why Most Adults Lose Their Best Friends by 30 The Friendship Calculation: Why Most Adults Lose Their Best Friends by 30 Reading Time: 5 minutes | Category: Relationships & Life Balance 📊 The Math That Changed Everything In 2021, one couple discovered a heartbreaking truth about adult friendships that will make you rethink your priorities TODAY. 💔 The Moment of Truth Charlotte and Raffi Grinberg were sitting in their Boston home, six years into their marriage, when morbid curiosity led them to a calculation that would change their lives forever. They asked themselves a simple question: "At our current visit rate, how much time will we actually spend with our best friends...