I don't really think the age a DC gets a console really matters. So long as it is done in a controlled and balanced way, gaming per se is not an issue for me.
We do have 2 rules in my house that I would recommend though.
- All screen time (whether it's gaming, TV or phone) has to be earned and time-limited- in our house school comes first, so we expect each DC to do a certain amount of study which increases with their age and allows them to earn screen time. So for example DS2 is in year 8 and he has to do 1.5 hours study each school night and 2 hours over the weekend (homework and revision)- he is then allowed 2 hours of screen time in the evening.
When he goes into year 9, he will have to do 2 hours of study each evening and 3 hours over the weekend, but he will be allowed half an hour extra screen time of an evening.
- DC should have to ask permission for all screen time and this should be a habit practised from a young age. So after they've done their study, the DC will come to me or DH and ask "please can I go on my phone" or "please may I watch Netflix for an hour".
You also shouldn't be afraid to refuse permission if you feel for example they haven't been behaving. Grades at school also come into it at mine so DC who I know have not tried their best will lose some of their screen time. I think having to ask stops then from just seeing screen time as a default activity and reminds them who's in charge.