Your account will not be deleted, but you will be unable to send or receive messages until you log in from a newer phone (Android 5.0+).
: WhatsApp currently requires Android 5.0 (Lollipop) or newer to function. whatsapp apk android 4.4 2 latest version
If your device is stuck on Android 4.4.2, you have a few options to continue using WhatsApp: How to Download WhatsApp on Android 4.1 to 4.4.4 Your account will not be deleted, but you