The search engine has finally become a teenager today, celebrating its 13th birthday with a new doodle on its homepage.

Having registered the domain on September 15, 1998 - Google officially celebrates its birthday on September 27 - founders Sergey Brin and Larry Page must have had little clue as to the $100billion+ company that they have now, just 13 years later.

First Google Homepage
What Google looked like in 1998

The 'Google doodle', as it has become known, changes almost daily to highlight significant days in history, most notably when the doodle featured a playable game of PacMan to celebrate the game's 30th anniversary. Today the doodle shows the famous Google logo sat around a table with a birthday cake, balloons and party hats.

The name is a play on the mathematical term 'googol' which is a 1 followed by 100 zeros.

Google claims: "The name reflects the immense volume of information that exists and the scope of Google's mission: To organise the world's information and make it universally accessible and useful."

Hopefully Google won't fall into the usual teenage behaviour of being moody, lazy and generally hating everyone and everything, and instead the company will be hoping to see many more years of growth as it continues to dominate the search market and beyond.