68 years old (Born on August 23, 1956)
Happy birthday, David! You've accomplished so much that even candles envy your epic flame—128 days aboard Russia’s Mir certainly gave you the galactic record for roommates who snore in microgravity. After all those shuttle trips and daring spacewalks, you've definitely earned cake that's out of this world!Still soaring high after all these years, you're living proof that age is just a number... well, here on Earth anyway. In orbit it might involve complex equations. Thanks for boldly going where most birthday parties won't dare venture—and never forgetting to come back home safely afterward! Wishing you gravity-defying celebrations ahead!