Jack Russell Terriers typically live between 12 and 16 years. Most sources agree on an average lifespan around 13 to 16 years with proper care, though some studies and reports note averages closer to 12 to 14 years

. Key points about their lifespan:

• Lifespan range: about 12 to 16 years, with many living into their mid-teens and some even reaching 17-19 years in exceptional cases

• Small size and hardy constitution contribute to their relatively long life compared to many larger breeds

• Proper care, including good diet, exercise, preventative healthcare, and regular vet visits, can help maximize their lifespan

• Genetic factors and health issues like Von Willebrand's disease or skin conditions may affect individual longevity

In summary, with attentive care, Jack Russell Terriers are known for their longevity, often living well beyond a decade and sometimes into their late teens.