The important details:

The easiest way to keep a Google Account active is to log in at least once every two years. As long as you have accessed your Google Account within the past two years, it will be considered active and will not be subject to deletion.

Additional means to maintain your account’s activity status include reading or sending an email, using Google Drive, downloading apps from the Play Store, using Google Search and watching YouTube while logged on, sharing photos, or using Sign in with Google with third-party services.

The rule also comes with certain exceptions, including Google Accounts with YouTube activity (channels, videos, or comments), holding a gift card with a monetary balance, that published apps on the Google Play store.

Gonna have to set some yearly reminders 🤔