It's 12 years old. Unless you're referring to more than one 12 year old, in which case it would be 12-year-olds.
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It's "Ten years old". Using an apostrophe after the letter "S" in "years" defines it as a plural possessive.
my name is k.koushik iam 12years old iam instarstad in mayadweepam plz add me in madweepam this is my number 8328483138
Born in Vienna on December 15th, 1928and died in 2000 He died on the Queen Elizabeth 11 cruise ship
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Chris Old is 69 years old (birthdate: December 22, 1948).
how old is Hesiod when he died how old is Hesiod when he died