Get in the damn capzone, no matter what your age is.
Toddlers, grandparents in a wheelchair, mummies, anyone - we really need EVERYONE in the capzone, as soon as possible.
Then, once half the team understand that, we can talk about skills, about doing the right thing, about knowing everything about the game, about pressing the right key, about not being childish.
...
Nah, really.
I was deeply saddened when a young player, who followed me as I was leapfrogging to the next capzone, who dived when I dived (good learner

), taking much more risk than he "should" have taken (according to his knowledge of the game), was caught by a MG gunfire, 2 meters behind me.
That player knew almost nothing about RO2, yet he made an enormous effort into getting into the game. When he wasn't dying "stupidly" to a viciously entrenched enemy, he was greatly helping us capture the point. And that's priceless.
...
Then there's that high-level player, who unlocked most weapons, have 200 hours in the game, camping 30 meters from our spawn. Sure he knows how to land the arty really close to the enemy spawn (note to TWI: arty on spawn is still not fixed...), where are the one-hit-kill spots on both tanks, where the capzone starts and ends (and the ninja-capture small corners).
But he's not making any effort, he's not helping his team.
=> The will to help your team is much more important than actual knowledge of the game. You can learn tips and tricks, but you can't learn to be a teammate.
...
And regarding age only (and not age+experience of the game), I have seen many 13-14 years old Commanders leading their team to victory through excellent management and carefully timed orders, again it's purely about willingness: to help your team, to learn.
Also, when you're telling a 13 years old Commander "hm, you should put your arty on the side of the house at C5, right in front of the D capzone", most the time they listen because they are willing to
learn.
Same with requesting Smoke grenades on the enemy position, some of them even go as far as dropping them (or giving you that role for a life or two) for you, so you can show them what you were trying to tell.