Year and Mistake
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I’ve been playing the piano since I was seven years.*
I’ve been playing the piano since I was seven.
Or
I’ve been playing the piano since I was seven years old.
Or
I’ve been playing the piano since I was seven years of age.
– When stating someone’s age, use just a number on its own OR a number + years old/ years of age (NOT years):
‘I’m almost eighteen.’ ‘My sister is fifteen years old.’ ” She was over sixteen years of age”