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).
Despite the centrality of age, it is not as obvious as one may think to measure age. If someone states that they are 35 years old, this means they have already celebrated their 35th birthday, but not yet their 36th birthday.