"PB" can refer to several things, so the answer depends on the context. Here are a few possibilities:
PB as a Person
- If you are referring to a person named PB, you would need to know more about them to determine their age. There is no way to find out a person's age without additional information.
PB as an Abbreviation
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If "PB" refers to peanut butter, it doesn't have an age. Peanut butter is a food product, and products don't have ages.
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If "PB" stands for something else, like a company or organization, you would need to provide more context to determine its age.