Google collects and remembers information about your activities, including the web, search, and your location history. Google now automatically deletes history for new users after 18 months, but it will remember history forever if you previously enabled this feature with default options.
As an existing user, to make Google delete your data after 18 months, you must enter your activity settings and change this option. You can also tell Google to delete activities automatically after three months or stop collecting activities completely.
To find this option, open the Activity Control page and log in with your Google account if you are not already logged in. Click the “Automatic delete” option under Web & Application Activity.
Choose when you want to delete data – after 18 months or 3 months. Click “Next” and confirm to continue.
Be aware: Google uses this history to personalize your experience, including your web search results and recommendations. Removing it will make your Google experience less “personalized.”
Scroll down on the page and repeat this process for other data types that you might want to delete automatically, including Location History and YouTube History.
You can also deactivate (“pause”) the collection of activity history by clicking the slider to the right of the data type. If it is blue, it is activated. If it is gray, it is deactivated.
If the “Automatic delete” option for history data type is gray, it’s because you paused (disabled) the data collection.
You can also go to the My Activity page and use the “Delete activity with” option in the left sidebar to manually delete various types of data stored in your Google account.
Be sure to repeat this process for each Google account that you use.