yes, but the way he acts doesn't reflect his age. aslan and abel act more naturally for the age, their romantic interest and the way they express it is more natural for kids their age. bellerophon's actions and his double face gives me the creeps, it gives me the impression of someone older having romantic interest into a child, i don't know but it makes me uncomfortable. ¯_(ツ)_/¯
XD .... yah, he is kinda older inside... or to be precise, something inside him is older than all of the living character's age combined lol
living in isolation also didn't help much, plus spending most of the time with Rykell ice block Cyclamen certainly is not a proper environment to grows as normal child XD
(he still excellent student, tho)

for me mabel and her dad and everyone on the manor are enough, there is no need for romance.
the withe haired kid give me the creeps.the fox and blonde kids seem nicer and even if they blush and have a crush on mabel it is more natural for their age - that being said where is abel my foxy baby??