Hello how may I help you? What is the average life expectancy in Denver? The average life expectancy in Denver is 84 years. What is leading cause of death in Denver? The leading cause of death in Denver is heart disease. Not ski accidents? My information is that the leading cause of death in Denver is heart disease. Not Marijuana overdose? There are no recorded deaths in Denver from marijuana overdose. Okay cool I'm going to move there Become a ski bum Come back if I can answer any more questions.