*Muzan os around 14, 13ish and Kagaya was only 4. They were both born ill, but loved to play, Muzan was very smart, but had troubles with his health and got sick often, but he was very smart for his age, Kagaya however, was autistic, he still hardly spoke and showed what he wanted to with body language and was developing a bit slower, but he was observant, and smart in his own way.