The RealAge test is probably the most comprehensive longevity calculator I have found. The questions dig deep into your health and medical history. My test took 20 minutes to complete but the questions were detailed and dynamically generated. Clearly RealAge has gone to a lot of effort to try and develop this longevity calculator. Visit their Web Site (unfortunately you do need to register and be subjected to their marketing efforts, but I am working on the assumption that I can unsubscribe at my convenience). It’s a privilege to be able to design a calculator that only future empirical evidence can validify.