What's the plural form of old man's beard? Here's the word you're looking for.
Answer
The noun old man's beard can be countable or uncountable.
In more general, commonly used, contexts, the plural form will be old man's beards.
However, in more specific contexts, the plural form can also be old men's beards e.g. in reference to various types of old men's beards
or a collection of old men's beards.
