Let's make this birthday one to remember.

66 years old (Born on September 27, 1958)

Happy Birthday, Shaun Cassidy! Wasn't it just yesterday you were solving mysteries with that flawless '70s hairstyle as Joe Hardy? Guess you're still the ultimate teen idol—proving detective work never ages out of style.

From chart-topping hits like "Da Doo Ron Ron" to a successful transition behind the scenes as a screenwriter and producer, you've shown you're way more than just another pretty face in bell-bottom jeans. Whether singing or storytelling, your timeless charm always shines bright. So here's to another year of adventures and surprises—hopefully less dangerous than The Hardy Boys' escapades. Keep rockin', Shaun!