He is a Chinese person.

He ate one apple.

My grandmother lives in a nursing home.

My grandfather is interested in gerontology.

My grandmother participates in the local old people's club every week.

He is known as an expert in gerontology.

An old person was walking in the park.

An old person was playing with his grandchild in the park.

My grandfather is being seen by a specialist in geriatric medicine.

I reserved a single room.