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I hope you don't have other small pets ie mammals or rodents. One might go missing one day. JkThe average appears to be 20. This one is easy to remember because we got him within a month or two of our youngest son being born.
Edit: my wife is a reptile whisperer. She got a baby boa constrictor when she was 11 and it lived 42+ years! She still has three snakes including Stormy here.