This is the 9813th most frequent Spanish word.
años
Years.
Here, 'años' is used to express age in years.
Tengo veinte años.
I am twenty years old.
In this case, 'años' refers to a span of time lasting three years.
Estudié español durante tres años.
I studied Spanish for three years.
Here, 'años' is used to indicate the age of the son in years as of today.