noun
1
BAD : I've been playing the piano since I was seven years.
GOOD : I've been playing the piano since I was seven.
GOOD : I've been playing the piano since I was seven years old.
GOOD : 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.'
2
BAD : Robert was a little boy of ten years.
GOOD : Robert was a little boy of ten.
◆◆◆
a boy/girl/son etc + of + number (WITHOUT years ): 'a child of six', 'a man of fifty'
3
See AGE 2 (↑ age ), 6, 7
4
See OLD 1 (↑ old ), 2
5
See RECENT (↑ recent )