The native Japanese numeral for eight, used for counting general items with the counter つ.
Please give me eight apples.
There are eight balls in the box.
eight years old
Used to state a child's age, typically for young children. The counter つ is traditionally used up to nine years old.
My daughter will be eight years old this year.
In the old Japanese temporal hour system, the day was divided into twelve periods, each named after an animal. 八つ corresponded to approximately 2 a.m. or 2 p.m., depending on the season. This usage is now historical.
In the Edo period, there was a custom of eating a snack at the hour of the 'yatsu' (around 2 p.m.).
There are eight apples on the desk.
My daughter will turn eight next month.