Depends on the animal (mutation) sex.
For example pastel male whether it's an hatchling or an adult your price will basically remains, same goes for a female, main reason is they are not that valuable and the market is flooded with them same goes with other old single gene mutations.
Than you have multiple gene combos and new mutation that will increase value, females more than male.
Bottom line you will see when you get there, you have not produced any animal yet, it's not a magic formula of it's that age, or that weight the price will go up or down, it depends on what you produce, the market at that time, whether you want to move your animals fast etc.
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