Meaning of the word "how old" in English

What does "how old" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

how old

US /haʊ oʊld/
UK /haʊ əʊld/

Phrase

used to ask about someone's or something's age

Example:
How old are you?
Do you know how old this building is?