There isn't an official age meme for HoM, but I decided to do one anyway. XD In case you're wondering why Gwen looks a bit different as a 14 year old, it's because I wanted to make her look a bit older. D: Originally she was actually supposed to be 13 years old, but I made one year older so she could be a head soldier. But anyway, info dump time~
10: In elementary school, Gwen was a lot more timid and reserved but was thought of as a trouble maker. Yet contrary to what most adults thought at the time, she didn't like getting into trouble with her classmates. However, her classmates often picked on her anyway for "trying to be a boy", so she was forced to defend herself. Adults either turned a blind eye or didn't understand her point of view. Therefore, she gained a strong sense of independence and pride at an early age, often refusing the help of others as time went on, in fear of being misunderstood or seen as weak.
12: When Gwen joined the House of Giants at 11 years old, the Houses accepted her with open arms. This accepting atmosphere allowed her to slowly gain more confidence in herself and become more assertive. Every day, Gwen trained with Xanthe to become the Giants' most powerful soldier. Although satisfying her curiosity about the spirits was important to her, in reality she also wanted to become a strong host to make up for the years of not standing up for herself.
14 (current age) : High school offered a fresh beginning for Gwen. Immediately she came out of her shell even more and joined the school's theater company to pursue her love of theater. Despite having a growth spurt when puberty hit her at 13 years old, she still felt the need to prove herself to others due to a deeply ingrained Napoleon complex she has, causing her to often come off as a bit arrogant and hot headed. Also, it was during this time that she rose the ranks of the Giants House to become the Head Soldier, allowing her to become more aggressive in studying the spirits (for better or for worse). However, she also began wondering if her research was even worth the effort.
16 (OMG THE FUTURE~) : By 15 years old, Gwen has mellowed down quite a bit and is almost completely at terms with who he is. He settles on identifying as gender neutral/gender fluid but prefers male pronouns, changes his style to something he's more comfortable with and becomes a prominent actor in the school theater company. Realizing he only has two years until he graduates from the Houses, he continues his research with newfound vigor, finding new purpose in his studies. (I don't want to reveal too much for this section in fear of spoilers for his story ;A; )