Peers matter more to the older DC - it is the natural order of things. The aim is to have an older DC with self discipline and you simply don't have that if you police them all the way. DCs with over controlling parents go one of 2 ways, they allow the control and find it impossible to cut free, the reason that DIL have problems when they won't accept it, or they lead a double life.
I was like that with mobile phones and DS was miserable, he was 12 and everyone did have one. He saved up and then my mother gave him the rest for his birthday. It was one of my nicest memories, he was over the moon.
What will you do when they have the money to buy their own?
My aim is to have DCs who can do things in moderation and be open with me and don't have double lives. I would be rich if I had £1 for every DC I know who can look their mother in the eye, parrot her view and do the opposite when she is out of view.
It has worked, mine are older and they don't feel the need to follow and they don't spend hours in front of a screen.
Parenting is the one job where the aim is to make yourself redundant! You give them roots and you give them wings, and hopefully they come back because they want to, and not through duty.
I love my mother more than my peers but her views and beliefs are her own and there is no need for me to follow them, or to make any difference to our relationship.