My common snapping turtle will be an estimated 60 this year. Yes, I know, estimation from size is iffy. He was caught during the summer of 1964 and given to me in 1965. At that time, I used the information gathered by Pell, assuming that the data for NY would be useful for mine (from CT). Pell found that they reached sexual maturity at 6-8 years, with a carapace 6-8" long. His was 7" at the time. On that basis, my turtle would be between 59 and 61 and the oldest ever recorded for that species.