So, you're wondering, "When did Ozzy Osbourne first start biting off more than he could chew, I mean, when did he become famous?" Well, buckle up, because we're about to take a trip down the yellow brick road of rock 'n' roll history.

Before the Bat Bite

Let's rewind to the swinging sixties, the decade of peace, love, and... heavy metal? Not quite yet. Ozzy, born John Michael Osbourne on December 3, 1948, in Aston, Birmingham, was just a kid trying to figure out his place in the world. He was a bit of a troublemaker, getting kicked out of school at 15 for being, well, a bit of a handful.

But here's where fate steps in. Ozzy met a guy named Tony Iommi at a job center. Tony was looking for a singer for his new band, Black Sabbath. Ozzy, with his distinctive voice and penchant for drama, was just the man for the job. And so, in 1969, at the ripe old age of 20, Ozzy joined the band that would make him a legend.

Enter the Prince of Darkness

Black Sabbath dropped their first album, "Black Sabbath," in 1970. It was a dark, heavy sound that was unlike anything else at the time. And guess who was at the helm, belting out lyrics about evil and the occult? That's right, our man Ozzy, at the tender age of 21.

Now, you might be thinking, "21? That's not famous!" Well, hold your horses. In the music industry, especially in the early 70s, that's practically a debutante ball. The band's second album, "Paranoid," came out later that same year, and it was a monster hit. "Iron Man," "War Pigs," and the title track became staples of rock radio.

The Madman of Metal

Over the next few years, Black Sabbath released a string of classic albums - "Master of Reality," "Vol. 4," "Sabbath Bloody Sabbath" - and Ozzy became a star. But it wasn't all peace and love. Ozzy's wild lifestyle caught up with him, and in 1979, at the age of 30, he was fired from the band he helped create.

But Ozzy wasn't one to wallow in self-pity. He launched a solo career, and with the help of some friends like Randy Rhoads and Dio, he became the Prince of Darkness we know today. His first solo album, "Blizzard of Ozz," came out in 1980, when Ozzy was 31. It was a massive hit, featuring classics like "Crazy Train" and "Mr. Crowley."

Ozzy Osbourne Revealed How He Wanted to Be RememberedOzzy Osbourne Revealed How He Wanted to Be Remembered

The Bat Bite and Beyond

Now, you might be wondering, "When did Ozzy bite the head off that poor little bat?" Well, that happened in 1982, when Ozzy was 33. He was performing in Des Moines, Iowa, and a bat flew onto the stage. In a moment of, well, let's call it "exuberance," Ozzy bit its head off. He later said he thought it was a rubber bat toy.

But here's the crazy part. Ozzy got rabies from that bat! He had to undergo a series of painful shots to treat the disease. But hey, it's not every day you get to say you survived a bat bite and became a legend.

From there, Ozzy's career was a rollercoaster ride of hits and controversies. He's had reality TV shows, reunited with Black Sabbath, and even gone on a farewell tour (though we all know he'll be back). And through it all, he's remained a beloved figure in the world of rock 'n' roll.

So, there you have it. Ozzy Osbourne was in his early 20s when he started making waves with Black Sabbath, and he was 31 when he launched his solo career. And the rest, as they say, is history. Now, who's ready to party like it's 1970?