On the Topic of Telemachus’s age:
First off preface lmao I’m a stranger on the internet if you want to see this and be like “I don’t care” more power to you this isn’t to condemn it’s more like my explanation? I guess? Of why Telemachus being represented as an adult is important to the context of the story and also to me.
Like obviously once again I acknowledge artistic interpretation, and Telemachus being young is important to the story as well and is part of the role he serves as a comparison to Odysseus, but like sometimes the way some artists draw him makes him look pre-pubescent and like… I understand what you’re doing, and honestly I respect it and I hope you are having fun, but I am holding your hands when I say that him being a young adult with that attitude is so so so important to his character and his relatability.
Adulthood isn’t something that magically appears one day, taking all of your dreams, immaturity, and weakness away. Telemachus embodies that- at twenty years old, he should be inheriting a portion of his father’s house and assisting in its running. He should, for all intents and purposes, have been a full and functional independent adult looking at purely his age. However, he is both literally and mentally stuck in limbo- his father is lost, so he cannot inherit in the case of his father’s death because Odysseus’ status is MIA, and internally he knows (literally mentioned book 1 of the odyssey and in Legendary) that if he reaches for that authority as an adult, the suitors will kill him. He doesn’t feel like he can, or that he is even on equal standing to the suitors as an adult man, he cannot see himself as one like they are, and it’s why he imagines his dad doing it instead. He wants to be saved, a childlike desire, even though he has advanced to a point where he himself can do something physically. That’s why, in the odyssey, Athena tells him explicitly that he can do something about the suitors, and lays out a plan for him. She says that he is no longer a child to his face, and the Telemacheia thus begins to be a coming of age story in which he matures, and later is registered as a threat of the suitors. He is a young adult yes, and he still has aspects of his young self (idealization of his father, daydreaming, him being quick to frustration), but him being an adult who realizes that he can do something and can understand the way he is childish is important and central to his character arc.
His arc is him growing into his skin, adulthood no longer being something that fits him like loose clothes and only a description of his physical state, but something that now is tailored to him, something that feels close to right.
Honestly, I think this aspect of him being an adult while still holding onto these aspects of childishness is where Legendary and We’ll be fine falls short in adapting his character. I understand why, because while he is introduced he is not the true central character of the Saga- it’s Athena and how he affects her, that’s what’s most important. Also, once again, he was just introduced. He’s not matured yet, but he’s realizing he needs to. I still love the songs and the saga, because it’s a good adaptation that poses interesting questions, but yeah. Telemachus is v clearly a young adult and that hasn’t translated over sound yet, which I think is why this whole age debacle is happening alongside the uwu-ifying of the man.
TLDR: Telemachus is a young adult and he acts like it due to his blend of childishness and slowly gained maturity. You can draw him and see him as a child if you want, have fun with it, but at least internally understand how his 20 years of age plays into his arc a of him maturing into manhood outside of your own interpretation of him :D