In general systolic BP in young females is less than that in the males of same age due to
In females before menopause SBP is 4-5 mmhg less than that in the males of same age .After menopause SBP is 4-5 mmhg more than males of same age. This effect may be due to oestrogen which prevents atherosclerosis. Ref: page number 349 Textbook of physiology Volume 1 AK Jain 7th edition
Dietary habits
Oestrogen which prevents atherosclerosis
Progesterone effect on blood vessels
Low sympathetic activity
Cardiovascular system