"The old-school way of accomplishing such blood-sharing is through “parabiosis,” which involves stitching two live mice together so that their circulatory systems intermingle. (Best not to contemplate that for too long.)"
Does this mean we should stick with young providers? Not for me!
I can only think of 3 providers under the age of 25 that I choose to see. That's because their maturity (sexually or otherwise) is much older than their years.
Otherwise I stay away from the newbies and VERY MUCH prefer providers OVER 25 years of age....usually closer to 30.