My younger sister is eighteen years old.

Tyrosine is one of the amino acids needed to make proteins in the body.

Despite his youth, he is well-versed in worldly wisdom.

He is giving his all to his job at his post.

He holds a very high position in society.

The economy is stagnating.

The economic stagnation continues.

We are considering buying a new residential land.

High temperature and high pressure are required to nitridate this metal.

Nitriding is often used to increase the surface hardness of metals.