New changes are in line with EU Regulations.
WhatsApp is lowering its minimum age limit in Ireland and Europe from 16 to 13.
It says it's making the change to make sure there is a consistent minimum age requirement across the globe.
Those using WhatsApp under 18 are still advised to have a parent or guardian read over the terms of service.
The changes are part of updated terms and conditions, which come into effect tomorrow Friday February 16th.