[recycled sixtie]

Just need your opinion and would not hold you responsible. I am 66 yo and take hi blood pressure pills. Resting bp is typically 120 over 80. Resting pulse around 60. My cholesterol is normal and my weight is 170 lbs. However when doing serious hiking in the mountains or walking thru 2 inches of snow yesterday my timex watch reads out 189 pulse if I don't slow down. I believe target max heart rate for my age is 220-66 is around the 150 mark. Am I risking it by doing exercise that takes my pulse up to the 180's occasionally?
Signed off paranoid!
My doc says that my risk for heart attack in the next ten years is 10% considering all factors. Thanks in advance.