How much does one year of teenage growth affect intelligence?

Hi, i'm 14 and am a freshman and i have a friend who's 15 who's also a freshmen. He's a year older than me. I was wondering how much of a advantage he has because of his age in school. So how much does one year affect teenage brain growth and how much of a advantage does he have? thanks a lot. I would prefer some empirical studies to back up any answers please.How much does one year of teenage growth affect intelligence?
Your question overlooks some premises that have to be understood in terms of intelligence.





Intelligence can refer to two things:





Aptitude and Ability.





Aptitude is your ability TO learn.


Ability is what you already can do.





There is biological ability - the amount of grey-matter you have in your brain to form connections - generally aptitude.





There's environment - an environment that either stimulates or inhibits growth - generally your ability.





You can have high aptitude but live in among a bunch of people who stifle your growth and have low ability.





Age is not the only determinant





Your brain is still growing as a teenager - but it varies so much from individual to individual there isn't a hard and fast rule.





A year of teenage growth is HUGE though in terms of brain growth and development.





Although age is NOT a predictor of advantage.





Go to www.apa.org and poke around in there and see what you find.How much does one year of teenage growth affect intelligence?
I guess it really depends on how much you try to learn, He's probably more mature than you.