(1)has attained the age of 12 years but has not attained the age of 16 years; and (2)is at least four years younger than the person so engaging; or attempts to do so, shall be fined under this title, imprisoned not more than 15 years,
(1)has attained the age of 12 years but has not attained the age of 16 years; and (2)is at least four years younger than the person so engaging; or attempts to do so, shall be fined under this title, imprisoned not more than 15 years,