When you sign up to play Elvenar, you agree to the published Terms and Conditions by clicking a box after you have read them. Within these (we put the link on the Announcement) it states, amongst other things that you need to be over 16.
This is indeed as our lovely Herodite has confirmed, all about Data and how it is handled. This is done very differently for under 16's, who need at the very least the agreement of a Parent or Guardian to act to also protect them until over this age. Data under this age is far more protected than for over 16's. This all comes under the GDPR act of 2018, which is all about how personal data is collected, used and stored, hence we all get the promts online about cookie policies etc: since this time
Regarding app stores, they do not recognise companies age ratings, instead they apply their own PEGI ratings . These are very different, however a player cannot get onto the game without agreeing to our Terms and Conditions, which is the legal basis of the contract to play the game.