RE: Can we ask for young blood to live more?
I don't know that there would necessarily be a mainstream market for this... except for maybe in a similar way that people can sell their blood plasma or the way that women can sell their eggs. Aside from asking someone to accept your bad/old blood, there are more things we can do to keep our blood from getting "old" to begin with. Also, does taking on someone else's "old" blood cause more accelerated aging in the young person who's swapping out their own blood. And would this mean that someone could have the excuse to live an extremely unhealthy life and essentially give the damage incurred by their bad habits to someone who takes care of themselves through a healthy life style. So while I'm not discounting it, but I'm saying there are a lot of problems with this beyond the moral argument. Who would willingly accept someone else's damaged blood and exchange it for their own healthy blood? I would never sign up for that job. Especially when I've worked so hard to keep myself healthy.
I see your point @timray, but I think it is exactly the reason why people would line up for this 'service': people don't want to work hard! Most people don't go to the gym because they like to work hard. When scientists invent a pill that get you a great body with the pain and the sweat, my bet is that gyms are going out of business. We want to do more of what we 'want to'. Not of what we 'have to'. Its great when the 2 things come together, but often they don't.
Very true, people are lazy AF. Which is why we have all the health problems we see in abundance to begin with.