My father is forty years old.

My grandfather is already sixty years old.

My grandfather is already sixty years old.

My grandfather is already sixty years old.

He has been living in this town for several decades.

He drew a decagon shape.

His company made a profit of one billion yen.

My pet Bengalese finch is very cute.

We have been working on this project for ten months.

In this experiment, we will measure the critical Reynolds number.