A person's age is a ratio scale because we can say person A's age is twice older than person B's. Equal difference ages on a ratio scale all have exactly the same size. Moreover in age, 0 (zero) exists, which is feature of a ratio scale.
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Ordinal. Though more likely interval or even ratio scale.
illustrate how you can express the age of group of persons as {1}nominal,{2}ordinal data,{3} interval data,{4}ratio data
Neither, age is at a ratio level of measurement.
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Bar charts are used to summarise nominal or ordinal data.