Let's make this birthday one to remember.

60 years old (Born on September 19, 1964)

Happy Birthday, Simon Lehna Singh! May your celebrations be as epic and intriguing as Fermat's Last Theorem—though hopefully not taking centuries to solve. Your brilliant storytelling in "The Code Book" has cracked open the mysteries of cryptography for countless readers, making complex math feel like a thrilling detective novel.

Here's wishing you another year filled with fascinating puzzles, groundbreaking insights, and perhaps fewer unsolvable enigmas. Keep inspiring us all by turning mathematical riddles into captivating adventures—we eagerly await your next literary masterpiece. Cheers to you on this special day; may it be infinitely enjoyable (but mathematically finite)!