im not sure with saw shells , are they a long neck or short ?should have added the species, saw shelled turtle. I have one here that i got as a youngster about 4-5years ago, i estimate the age at 6-7years and the carapace is approx 20cm, to me that does sound a little small but from what i have read i'm not too sure
I would say there is no hard and fast rule to determine age as they vary heaps.
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