Google is now eleven years old on Sunday September 27.
Google’s official birthday isn’t exactly clear. Some say the company was born on September 15th 1997, the day the domain was registered. The Google incorporation paperwork was filed on September 4th, but Google has been known to celebrate on both September 7th and September 27th.
To explain the inconsistency, the company’s FAQ once said:

“Google opened its doors in September 1998. The exact date when we celebrate our birthday has moved around over the years, depending on when people feel like having cake.”

In recent years, Google has taken to changing its logo on September 27th, which more or less means Google has settled on a fixed date.
We’re looking forward to many more years of Google.
Happy birthday Google. Oh, and don’t worry about getting bigger, it comes with aging.