Whatsapp Submitted new Update in their version 2.19.222 through Google Beta program which has Fingerprint lock and Age restriction features.
With the help of fingerprint sensor protect with layer so no unauthorized person can see your WhatsApp and you do not need any third-party app to do this.
This option is disabled by default you need to enable this option by going to WhatsApp Settings > Account > Privacy > Fingerprint lock.
If you don’t see this feature in your phone so please update your android version because this feature needs android (6) marshmallow or higher version (for beta version)
Don’t worry if you don’t see this feature in new update Whatsapp will available this feature as per WEBETAINFO
When you enable Finger authentication option it will ask to activate immediately or in 1 minute or 30 minutes choose as per your wish.
WhatsApp also updates their term and condition last year about age restriction to using Whatsapp. They apply Age restriction as WhatsApp is starting to develop a feature to ban users that don’t meet the minimum age requirement by this new update
But we do not know how WhatsApp detect the age of WhatsApp user it after applying we know.
FROM NEW TERMS OF SERVICES:https://t.co/KvjzuAwtGc
Age. If you live in a country in the European Region, you must be at least 16 years old to use our Services…. If you live in any other country except those in the European Region, you must be at least 13 years old to use …
— WABetaInfo (@WABetaInfo) April 24, 2018
So these are the major update which Whatsapp introduce now what you think about this update post your view in the comment section.