to me much of maturity is in our control of our emotions and impulses, our ability to behave rationally instead of responding reflexively. also, the ability to empathize with others.... with that being said studies have shown that girls begin puberty approximately two years before boys. during which their brains make the all-important hook-up between the emotion center of the brain and the language / reason-rationality center of the brain.... so i do think there is some truth to it....
however one's attitude towards marriage or one's hobbies for the most part is not really a great indicator of maturity or lack thereof...a woman could want to marry and have children at an early age but that doesn't make her any more mature than the middle aged bachelor. she could be marrying whoever to please her family or to impress her friends or because she didn't want to be alone, which in my eyes is a sure sign of immaturity... the middle aged bachelor could have a great career, fiscally responsible, a great friend, son, father, brother, etc and a video game player but he's single because he knows he isn't the marrying type...what's so immature about that?
also i am a grown ass woman i like to play video games from time to time.... but i handles my business