I've not come across anyone who would want to be transfused unless they desperately needed blood like after an accident or an operation.
I used to donate blood, did it quite a few times. It doesn't take that long & best to think about something else while it's going on but it's not a pleasant, comfortable sensation. Receiving blood, if you're fully conscious, must be weird. Ifyou need it, fair enough but to invite it for no reason strikes me as ridiculous.
The idea that young blood is going to rejuvenate sounds like pie in the sky. I'm keen to hear the resuls of the 'clinical trial' but doubt there will ever be anything published.