Bengal cats are pretty good cats and are a pretty healthy cat breed overall.
As long as the cat was bought from a registered and reputable cat breeder then the Bengal cat should live from 14 to 16 years with proper care and vet checkups for the Bengal Cat.
The Life Expectancy of Bengal Cat is the same as any other cat which can live from 14 to 16 years and in some cases cats have lived from 20 to even 30 years.