Age

Nan sai desu ka/ Oi kutsu desu ka - How old are you?

issai - 1 year old
nana sai - 7 years old
hassai - 8 years old
jūssai/ jissai - 10 years old
jū issai - 11 years old
jū hassai - 18 years old
hatachi - 20 years old
ni jū san sai - 23 years old
san jū sai - 30 years old