The UK Safer Internet Center has some really useful resources for parents and Careres, including advice and information on your child's devices, social media and how to keep your child safe online. 

https://saferinternet.org.uk/guide-and-resource/parents-and-carers

WhatsApp is a social messaging app from Meta that is used by over 2.7 billion people every month. It lets users message others via their mobile network, Wifi network or, via WhatsApp Web, their broadband network. 

The minimum age to use WhatsApp is 13 years old 

click below for further advice from Internet matters:

https://www.internetmatters.org/advice/apps-and-platforms/social-media/whatsapp/