I still get phone calls for a nearby regional hospital to give blood, I’m 70.
I give it several times a year, they tell me where is used and thank me after. Makes me feel good that I helped somebody. (my wife had a number of transfusions last year after she had stints put in and put on anti coagulants.)
my understanding is that giving blood is healthy for you. it thins the blood in a natural way rather than using something like rat poison to do the job.