One Is One

Today, at the gym, on the bike, as I have countless times before, you type in the time you want to ride it (60 minutes) and they also ask your age to compute what your heart-rate should be. This was the first time I typed in "31" as my age. As a result, my target heart rate went down from 124 to 123. If this continues, I can extrapolate that I will be dead before I am 154...