Because BP's grow at vastly different rates it's impossible to say based solely on age.
You want a rodent that is as wide as the widest part of your BP. You can also use the 15% rule as a very general guideline.
The 15% rule is to feed a rodent that weighs 15% of the weight of the BP. So a 100 gram BP would eat a 15 gram rodent (100 grams x 0.15 = 15 grams)
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