That aside, it is also known that the youngest person to join the Knights was a 15-year-old warrior. Given the kind of a warrior Kaeya is, there's a high chance that he's the 15-year-old warrior who joined the Knights in Genshin Impact
Genshin Impact is an action role-playing game developed and published by video game company miHoYo.
Kaeya and Diluc might have the same age (more info in comments). Diluc was Jean's superior before he quit the Knights. She is slightly younger than him, and she calls him “senpai” in the Japanese audio, so she is 20-21 at most. Barbara is Jean's younger sister (approximately 16-18 years old).
KAEYA PRINCE OF THE ABYSS! Savior or Destroyer | Genshin Impact
How old is Zhongli?
Like Venti, Zhongli's true age is never specified. It's said that Morax is over 6000 years old, as he helped shape the geography of Liyue. Over 6000 years old is a vague number, but it confirms that Zhongli isn't anywhere below 6000 years. Predictably, this makes Zhongli the oldest character in Genshin Impact.
Jean and Diluc are probably one of the relationships closest to actually happening in the game. The two know each other very well, and Diluc admits to having great respect for Jean. He allows the Knights of Favonius to throw a party for her, with free drinks to help her relax.
Paimon in Genshin Impact appears to be around 5-7 years old, judging by speech ability and physical dimensions. However, Paimon proves to be very knowledgable when it comes to the world and its history, with an understanding that goes beyond what even the most intelligent 7-year-old would comprehend.
The only concrete information on Fischl's age is that she received her Electro vision at the age of 14. This means that at the very least, Fischl is 14 years old, but another snippet of information points towards her being older than that.
Lumine and Aether are referred to as twins, meaning that they are the same age. Their appearance seems to be around 14 to 16 years old, but we know that they have been in Teyvat for more than 500 years.
It's better than nothing, but the more interesting leak is that he's shorter than Xiao, who used to be the smallest playable male character in the game. Xiao is 5'3'' (160 cm), so Heizou is supposed to be shorter than that.
What's the gender of Paimon? Paimon is a female NPC in Genshin Impact that follows you around and will act as your guide for the continent of Teyvat. She enters the story as a character saved by you from a lake that she was about to drown in.
But I hate its primary teacher, Paimon. Paimon is a shrill toddler fairy, a consistently stupefied echo rattling around in a porcelain doll, the funny guy your friend knows whose idea of comedy is light bullying but with wings and a voice pitched so high it genuinely hurts to listen to sometimes.
In both the game and the manga, Genshin Impact frames the relationship between Kaeya and Diluc as being largely one-sided, mostly strained by Diluc. Kaeya helplessly grew to feel shunned by the only person who knew everything about him, but it still seems like he longs for Diluc's approval.
Kaeya enjoys tormenting Diluc and, in many ways, is the polar opposite of him. Many fans don't realize that Kaeya is actually Diluc's adopted brother and that the two have lived together for quite some time. Despite the tension, though, they have both shown at times that they do truly care about each other.
Although Jean and Barbara may have different last names, it is still confirmed that they are sisters from their character stories profile. Who is Klee to Jean? Such more, there was also an official ad from MiHoYo that included Jean chasing Klee.