The mean is a type of average. You have told us that the average age is 24. If this is the mean average then you have answered your own question.
So first you need to establish whether the average you are quoting is the mean, median or mode average. If it is the mean average then you have your answer. If it is not the mean average then you can calculate this by summing all the ages and then dividing by the number of people whose ages you have just summed.
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