If they believe that the applicant will live long and will therefore make a substantial number of insurance premium payments during his/her life, then life insurance companies see the applicant as low risk to their business. However, if life insurance companies believe that an applicant could die soon, and therefore make relatively few insurance premium payments while they are alive, that candidate will be seen as a higher risk by the insurance companies.
How life insurance premiums are calculated
When calculating life insurance premiums two factors are considered by life insurance companies. The first factor involves an evaluation of the general likelihood of death occurring at a particular age, and involves the scaling of applicants against normal life expectancy. This sets the 'average' risk level that different age ranges attract; needless to say that the closer you are to your average life expectancy then the higher the risk level that you'll be measured against.
The second factor is based on whether the applicant is above or below their average risk level for their age. Someone who has an unhealthy lifestyle, suffers from pre-existing health conditions and is in a stressful job is likely to be classified as 'above average'. On the flip side, someone who goes to the gym regularly, does not smoke and eats a balanced diet is likely to be seen as 'below average'. Naturally, those who are below average risk will see keener insurance premiums on their life insurance policy for their age than people who are classified as 'above average'