chronological age
noun/ˌkrɒnəˌlɒdʒɪkl ˈeɪdʒ/
/ˌkrɑːnəˌlɑːdʒɪkl ˈeɪdʒ/
[uncountable, singular] (formal)- the number of years a person has lived as opposed to their level of physical, mental or emotional development compare mental age
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chronological age