Dietary fats are important because they are the ones that produce  energy for the body. Fats should be monitored since excessive fats  can be risky for your health.
Age last birthday: One method of insurance rating which rates people a their age as of their last birthday, with such rating held until the next birthday. If your policy is approved at your current age (prior to your next birthday), you will be rated at your current age (as opposed to age nearest birthday).
number of years remaining between his age at death and his 65th birthday. (For example, a man who dies at age 20. contributes 45 years to the overall average; a man who dies at age 60 contributes only 5 years to the average.) Table 2.