Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
My answer is:
The average heart beat for a human adult ranges between 60 and 100 beats per minute (bpm).
The
heart rate varies very much between people, but in general the more fit and athletic a person is the bigger his/her heart is, meaning that the heart will have to contract and enlarge (to beat) fewer times in a minute in order to pump the same amount of blood.
This is why athletes or other people engaging in physical activity have a larger heart and a lower heart rate.
In your case it is perfectly clear that you are a person engaging in physical activity and your heart has been adapting to this situation by enlarging and consequently the heart rate goes down. This is perfectly OK!
Regarding
blood donation at your age, the recommendations are that after the age of 75, blood donation should be handled with care because of the increased risk of reactions after blood donation and the increased time to recovery after such reactions.
Therefore, I would recommend you to continue blood donation if you feel OK with this and if you have never experienced any kind of reactions after blood donation (for example, pain at the site of blood taking, bleeding, feeling
cold, feeling weak,
vomiting,
fainting, etc.). In case you have experienced any of the above mentioned symptoms then you should stop donating blood, as a precaution measure to protect your own health.
I hope I have answered your question and let me know if I can assist you further.
Wish you the very best of luck!