Fascinating.
Now how’s about figuring how to get the hair on my head to grow again!!
:)
To;dr version: mitochondria produce energy for us, and as we age get shorter lifespans themselves which leads to most of the normal aging conditions. Being able to transfer means importing young cells...
... I stop short of knowing what the cost to others might be or what unforeseen consequences occur to the recipient. Might be none either way, which presents a totally different litany of issues (e.g. Bill Gates doesn’t want a long living humanity but a short brutish existence he can rule).