WhatsApp will allow to hide last seen status for certain contacts. WhatsApp has provided such a feature in the beta version of the iOS app.
According to Wabetainfo, WhatsApp has introduced a feature that allows you to hide your last seen status from certain contacts. Last Seen Status lets you know how much time a user has been using WhatsApp.
If you don’t want this feature, you can disable it yourself. This feature can be accessed through My Contacts Accept.