I have a good friend close to your age who is pace maker-dependent, meaning he will die if it quits. He is an AA-caliber rider and we even rode 7 days in CO this summer. That'll get your heart pumping! His is set to 140bpm maximum. I also have a friend that had a heart attack while we were riding. We recognized the signs and got him to an ambulance. Luckily we were close to a state highway when it happened.
I'm 56 & know CPR.
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