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).
1. the period of time that a person, animal, or plant has lived or is expected to live: the age of a tree; what age was he when he died?; the age of a horse is up to thirty years. 2. the period of existence of an object, material, group, etc: the age of this table is 200 years.