An old person was walking in the park.

He is an acquaintance of mine.

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

Racism is an act that is absolutely not allowed.

I am an Earthling.

He is a true humanitarian, always striving to alleviate the suffering of others.

He often thinks about problems from a humanitarian perspective.

He decided to become a subject of the human experiment for the new drug.

Saving lives is the top priority.

He is said to have a long philtrum.