I don't think it works that way. Currently most human-on-human violence is committed by young people (specifically young men), who by this logic should have the lowest time preference, since they can expect to have the most years left to live.
So, depending on how much of this decrease in violence with age is biological and how much is memetic, stopping aging (assuming it would lead to a large drop in the birth rate) may increase or decrease the total violence in the long run (as the chronological age of the population increases but its biological age decreases).
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