If they are indeed 02s, they should be more than mature enough to breed at eight years old. Not all obsoleta get to be huge six plus foot animals, and some probably stay in the three plus foot range pending on the size of the population they originated from. At eight years old, I doubt they will have any more significant growth. The lack of size may also indicate there is some non-obsoleta blood in the mix, like maybe cornsnake. Based on the photos, I am leaning to them being some type of amelanistic obsoleta integrade like a bubblegum rat that has black rat, yellow rat, and glades rat mixed together and borrows the amel gene from the black rat. This mixture also results in a variety of pattern seen in the same clutches. Animals range from totally blotched, intermediate, and probaby even fully striped at times. Your animals could be the hypo variant of the bubblegum rat, and borrwed the hypo gene from the black rat. Really hard to say. However, since they are a "matched" pair, they should breed true regardless of being amel or hypo.

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