My bp is 90/70 and my age is 24.is it normal?

It is acceptable. : The blood pressure is only one of the ways to look at overall health. Generally speaking a low blood pressure in otherwise healthy individual may be nothing to worry. But if it is associated with dizziness and feeling nauseated or out of breath most of the time then you need to get checked. Othwise srink plenty of fluids and relax and take it easy. Have a wonderful day.