Looking at a sample of 40,139 death records from the Veterinary Medical Database from 1984-2004, scientists from the University of Georgia determined the average age at death for dogs that had not been spayed or neutered was 7.9 years versus 9.4 years for sterilized dogs.
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Castrati 1.0
When the valves in the veins near testes fail as we age, the concentration of testosterone in the backflow can cause the prostate to swell up.
Would you chop them for extra years though?
1. https://ami.group.uq.edu.au/castrated-men-live-longer
2. What a great reversal of the usual 'in mice' trope.
I do wander if they had to pad the cages to prevent them from committing suicide thou.