Here are three actuarial longevity calculators with increasing levels of complexity. The third (Dr. Perls) provides very detailed suggestions on how to improve your odds!
Actuaries Longevity Illustrator
This calculator by the American Academy of Actuaries and the Society of Actuaries is the simplest calculator to use (6 questions).
It is primarily geared towards planning retirement finances, so it can also take into consideration the life expectancy of your life partner.
Provides a nice graph of probability of living to different ages.
Its main drawback is lack of specificity.
Blue Zones (University of Minnesota)
This test takes around three minutes. It asks around 20 questions including some on general health, exercise and diet, and provides estimates of your Total Life Expectancy, your Healthy Life Expectancy and your Potential Life Expectancy if you do everything right 🙂
Can provide suggestions for improvement.
Living to 100 Life Expectancy Calculator (Dr. Thomas Perls)
My favorite! This is by far the most comprehensive evaluation with a total of 43 questions covering Personal, Lifestyle, Nutrition, Medical and Family factors.
It also provides detailed feedback on your answers. Well-worth spending the 20-30 minutes that it takes to complete.
Dr. Perls also has a book that he will be happy to sell you.