• This sentence is a variation of a common proverb which suggests that just because someone is old (represented by grey hair), it doesn't necessarily mean they are wise.
To choose the correct word, we have to look at homophones—words that sound the same but have different meanings and spellings:
Hair (Correct): The strands that grow from the skin of humans and animals. "Grey hair" is a physical sign of aging.
Heir: A person legally entitled to the property or rank of another after that person's death (e.g., "The prince is the heir to the throne").
Air: The invisible gaseous substance surrounding the earth.
Hare: An animal similar to a rabbit but with longer ears and legs.
