Bledding from nose is called epistaxis
It has many causes and there is a hereditary tendency in some families as well.
Prominent causes are- 1.Local abnormal arteriole
or venules inside nostrils called Little's Area.
2. Nose picking 3. Dryness and excessive cold/hot environments
5. Hematologic malignacies to name a few causes.
At your age Hypertension is an unlikely cause, some times the arterial pulses may be palpable when we are taking an odd posture suddenly.
If the Temple artery
pulsation is visible and associated with pain you might be suffering from TEMPORAL ARTERITIS
and that needs a good work up by Physician because that disease have serious consequences if left untreated.
Meanwhile stop nose picking, apply local emolients and apply local pressure for 5-10 min to control epistaxis related nose bleed.