According to the Chinese, Japanese and Korean pronouns the twins use to address each other in the opening cutscene and in later interactions, Aether is the older twin and Lumine is the younger.
Lumine and Aether are considered twins because they are the same age. They appear to be 14 to 16 years old, but they have lived in Teyvat for more than 500 years. This is supported by the fact that they were separated after attempting to flee the world during Khaenri'ah's fall.
Appearance. The Traveler is at least 500 years alive and they both appear as young adults. Both Aether and Lumine have blond hair, have golden eyes, fair light skin, and are both twins. They both have different outfit colors from each others.
With what Genshin Impact fans know so far of its ever-expanding story, Aether is at the very least over 500 years old.
Lumine actually. has a higher charged attack damage bonus than ether. Coupled with her attack speed, she actually has a higher DPS.
Tropes. Xiaother is the slash ship between Xiao and Aether from the Genshin Impact fandom.
1 Lumine + Childe
Ever since the "Hey girlie," scene in Liyue, Childe's friendliness towards the Traveler, especially Lumine, has made the two one of the most popular ships among the fanbase.
According to the Chinese, Japanese and Korean pronouns the twins use to address each other in the opening cutscene and in later interactions, Aether is the older twin and Lumine is the younger.
Aether and Barbara are actually dating.
Venti has a Crush on Aether - Genshin Impact Comic Dub.
Interestingly enough, Xiao and Lumine are placed together in the balcony, which not only is the place where they first met, but it's canonically a haven for lovers to meet up at.
A Genshin Impact player has found a detail potentially proving that Lumine is the game's true main character. At the start of the game, players have the option to choose between Lumine and Aether to become their Traveler whose main quest is to find their lost sibling.
Xiao is highly protective over the Traveler, to the point that they only need to speak his name to have him appear in front of them. He also has a soft spot for Ganyu and takes time out of his day to train her. This is despite the fact that it seems like Xiao doesn't have any strong feelings towards her.
She's called Yíng (荧) in Chinese, Hotaru (蛍) in Japanese and Lumine in English and other languages. Her canonical name is uttered once in the game by her brother if player selects him.
Is traveller minor? Technically not. They may have a body of a teenager, but that doesn't stop miHoYo from making them older than 500. It's the same with Venti, Zhongli, Ganyu, Qiqi(Except Qiqi has the body of a child).
Many people began to ship them when Childe saved Lumine and because of the "Hey girlie" , and the ship became even more popular because of the Childe Story Quest, in which Lumine is befriending Childe and is promising Childe to visit him and his Family in Snezhnaya.
Based on this, the approximate Hu Tao's age ≈ 18-20 years.
Genshin Impact - Aether Meets Lumine Again After Losing Her (Reunion)
Genshin Impact is an open-world role-playing game (or RPG) by game developer miHoYo. The open-world element allows players to explore the world freely at their own pace – there is no one way to play. It has an age rating of PEGI-12, but no strict age verification process, so nothing stops younger children signing up.
8 Nahida, 500 Years Old
Within the story, Nahida considers herself a young Archon with much to learn, and she is portrayed with a childlike appearance.
Ajax, better known as Tartaglia and by his codename Childe, is a major antagonist/anti-villain, boss fight, and unplayable character in the 2020 action role-playing fantasy video game Genshin Impact. While first introduced as an ally to the Traveler, he is later revealed to be the Eleventh Harbinger of the Fatui.
11 He Is Extremely Interested In Lumine/Aether
Childe doesn't exactly hide the fact that he wants to adventure with the Traveler. In fact, he straight out states it in his letters to his family.
It currently one of the most popular Aether het ship in the community. There were lots of implications that Ayaka had a crush on the Traveler due to her Story Quest and her special dish description, which was the reason why Ayather sailed.