This old building was built when my grandfather was young.

He sifted the flour through a sieve to make bread.

We are planning to build a new house.

That building is very old.

My grandfather is healthy and living a long life.

He is still young.

He is still young, and looking forward to his future life.

He is still young, so he needs to learn a lot of things.

At that time, I was still a student.

At that time, he was still a student.