From Derek Hodges, Perth, Western Australia
As a person in my late 50s I was fascinated by Sally Adee's report on the use of “young blood” in rejuvenation efforts (30 September, p 39). I was intrigued by the suggestion that simply removing “bad blood” might be the prime mechanism. As a chemical engineer I am well aware of the need for a purge stream in any closed-loop cycle.
Surely there is a population of blood donors who have donated every couple of months for more than 40 years. Do they have a longer lifespan or otherwise indicate a younger “biological age”? Has anyone examined that?
