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There is some evidence that high blood iron levels increases the risk of heart attack and stroke. So donating blood regularly may actually be good for you.

http://www.webmd.com/news/20001025/too-much-iron-may-lead-to...

"Average" life expectancy is deceiving. Much of the gains in human life expectancy have come from reductions in infant and childhood mortality, which alters the average substantially.

Regular blood donations? Yep, that's crazy.

I'm up above nine gallons donated, lifetime, and I'm ready to give more as the occasion allows. I'm much above the age of thirty, considerably above the model age of most readers of HN.

https://www.givelife.org/