I am 57 rest pulse is 40-42 been running and cycling all my life. I cannot get my heart rate about 155 that I can recall in the last few years. On a huge climb about 8% grade I got it to about 154 thought I was coming apart. Yesterday I ran 7 miles at 10:45 pace and HR was 124 average maxed at 141. If I sprint running I can get it close to 150. My heart rate recovery on garmin after 2 minutes of hard work is usually 48-62.

You must be able to put out a lot more power than I can.