* First conception: The idea of a comprehensive English dictionary dates back to the 18th century, with the work of Samuel Johnson.
* First publication: The OED's predecessor, the "New English Dictionary on Historical Principles," was published in 1884.
* Ongoing project: The OED is still actively updated and expanded, with new words and definitions added regularly.
* Digital era: The OED went online in 2000, making it more accessible than ever.
Therefore, you could say the OED is over 130 years old, based on its first publication. However, it's a continuous work in progress, constantly evolving to reflect the changing English language.