The average lifespan of a Squirrel Monkey is about 15 years. However, some individual monkeys have been known to live much longer – up to 20 years or more. In captivity, where they are provided with good care and nutrition, Squirrel Monkeys typically live even longer than in the wild. So, if you’re looking for a pet monkey that will be with you for many years to come, a Squirrel Monkey would be a good choice!