Why adolescent boys require more iron than girls?

You have it backwards.

from the NIH:

{| ! Age ! Males

(mg/day) ! Females

(mg/day) ! Pregnancy

(mg/day) ! Lactation

(mg/day) | 7 to 12 months1111N/AN/A1 to 3 years77N/AN/A4 to 8 years1010N/AN/A9 to 13 years88N/AN/A14 to 18 years1115271019 to 50 years81827951+ years88N/AN/A

Iron is only lost from the body when skin cells die or through mucus. Women lose iron through menstruation and vaginal mucus in general.

|}