At least three things come to mind that shorten a captive boas life:
1) A sedentary life. That combined with over feeding and a very rich diet. Most boas are confined in a very small space relatively speaking.
2) Many boa breeders raise their boas quickly in order to produce babies as soon as possible and recoup their investment. Just about everyone agrees this is detrimental to longevity.
3) Husbandry and keeper errors due to lack of knowledge or neglect. Most people haven't a clue. Others may loose interest or just don't care.
jsc
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"As hard as I've tried, just can't NOT do this"
John Crickmer

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