A newborn person that has just begun to explore the world. Some talk, some don't. The development of the human body also happens the fastest in this time, so the baby's age is mostly counted in months or even weeks in this time. People aged this young have no real consciousness, but show human characteristics. Not much to say about people aged 0.
Part of the Age Group: Baby
0 year old: Goo ga goo ga.
Marcus: Is this your son?
Thomas: Yeah, but he's only 0 years old yet, or 7 months to be exact.
A Shit-year-old is the term for a grown peron who behaves like a child, in a paticularly shitty way. The sort of person who refuses to belive cartoon characters aren't real, claiming that they "exist somewhere".
"Jesus, Guy showed up in his Goku costume, tail and everything! He's such a shit-year-old!"
Someone in their 20s who is down to clown and too young too care about anything else. Likely clubs too much and doesn't have a lot of their own money.
Looks like someone has a new twenty-fun-year-old!
the brief description of senpai, a famous Japanese actor ,who constantly stinks
24 years old and is a student