He works at a famous host club in Tokyo.

I distributed materials to all participants.

I will abstain from attending this meeting.

We are participating in this project by delegation.

Please remember to bring your admission ticket.

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

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

An old person was walking in the park.

He is known as an expert in gerontology.

My grandfather is interested in gerontology.