For the OP here are my measurements from today. I'm 57 @5'10" and 202 lbs. My resting heart rate was 52 today. (It used to be 50 but I'm recovering from a tear in my knee.) I did 100 one handed swings in groups of 20 at 32 kg and took 7:31. I'm new to 32 kg, but was swinging 30 kg for a month before. My peaks were 128, 135, 139, 143, & 142. Each time I rested down to 105 or 106.
For me this is about 10 bpm higher than I would have liked. I know that my max heart rate on a VO2 Max test is about 145. So I'd like to peak around 130. Which will likely happen in another week of training. The big issue for you will be your age. You lose about 1 bpm each year. So if I was 47, that heart rate would be good for me.
I use a Polar monitor with a chest strap each time I train. That gives me some good history to review to be able to measure progress. I can compare my training log to my heart rate and tell how hard I was working.