When you have bradycardia (a slow resting heart rate less than 60 BPM), your body compensates for the decrease in beats-per-minute with larger stroke volume by the heart. In healthy individuals, bradycardia is termed "athlete's heart" and is the left ventrical's normal adaptation to the stresses of exercise - especially weight training - by growing thicker and pumping stronger with each stroke. In unhealthy individuals, this leads to cardio-myopathy and eventually death.
As systolic is the pressure in your arteries when the heart pumps, healthy endothelium (interior lining of arteries) will suffer no ill effects as log as it is not too high. The consortium that sets blood pressure standards is the JNC (Joint National Committee). The biggest change to BP recommendations came in 2003 with JNC 7 where they said anything over 120/80 is "pre-hypertensive". However in 2014, the JNC 8 revised these guidelines and did away with the "pre-hypertension" classification and stated blood pressure of 140/90 or less is normal. They also recognized that as people age their blood pressure naturally increases due to the aging of the cardio-vascular system. Monitoring is still highly recommended for all individuals. A high diastolic pressure combined with high systolic is more troublesome as your diastolic reading is the pressure in the arteries in-between heart beats. The main damagers of the endothelium are high blood sugar, high blood triglycerides, and oxidized LDL cholesterol. 95% of these problems are diet related.
As long as your kidney function is normal and your blood cholesterol and triglyceride profiles are fine, I would not worry. The kidneys produce hormones that control blood pressure - Renin which then controls the production of angiotensin and aldosterone. Some people produce more angiotensin than others. Angiotensin constricts the endothelium. Aldosterone causes the kidneys to retain water. This is why alcohol makes you urinate so much as it blocks aldosterone.
John