81 years old (Born on May 20, 1944)
Happy Birthday, Per! From solving decades-old puzzles in functional analysis to dazzling audiences with your musical genius, you've truly mastered the art of making complexity look easy. Rumor has it that even mathematical equations celebrate when you walk into a room—after all, you're their favorite prodigy!Whether it's unraveling intricate problems or captivating listeners at the piano keys, your brilliance continues to inspire us all. May this birthday be filled with laughter and joy equal to the number of mathematicians still scratching their heads over your groundbreaking solutions. Here's wishing you infinite happiness and countless more harmonious years ahead!