Google is finally allowing some Gmail users to change their account’s username while retaining everything else. This feature was teased late last year and has now been made available to all US-based Gmail users. The new username will retain the same account, so emails sent to the old address will continue to arrive at the new inbox.
To change your username, go to Settings > Personal info > Email > Google Account email. Click “Change Google Account email” and choose a new username. Note that you can only make this change once every 12 months.
This feature is great news for users who want to update their old Gmail address after 22 years. So, are you ready to change your Gmail username?
Source: https://mashable.com/article/how-to-change-your-gmail-username