sentence: The maximum hair length that is possible to reach is about 15 cm for infants (below the age of 1), about 60 cm for children (below the age of 13), and generally 100 cm for adults.
modified: The maximum hair length that is possible to reach is about 15 cm for infants (below the age of 1), about 60 cm for children (below the age of 13), and generally 100 cm for adults.