In order to maintain a weight of 145 pounds, you will need to make sure that the number of calories you consume every day is equal to your body's daily calorie needs. The number of calories your body needs varies from person to person, but can be estimated with allowances for gender, height and activity level.
Sex
In general, male calorie requirements are slightly higher than female requirements, even when the individuals are of similar height and weight. For a 30-year-old male weighing 145 pounds and standing 5 ft 8 inches tall, the daily calorie requirement is 2,150 calories if he maintains a somewhat active lifestyle. For a female of the same height, weight, age and activity level, the daily calorie requirement is only 1,800 calories.
Age
Generally, as a person ages, his calorie requirements decrease steadily. The MayoClinic.com's online calorie calculator tool states that at a height of 5 ft 5 inches and maintaining an active lifestyle, an 18-year-old girl will require 2,150 calories daily to maintain a weight of 145 pounds. The same woman -- at the same height, activity level and weight -- will require only 1,750 calories daily when she is 80 years old.
Exercise
The more active your lifestyle, the greater your daily calorie needs for maintaining a steady weight. For example, a male who is 40 years old, 5 ft 7 and 145 pounds will require only 1,850 calories daily if he leads an inactive or sedentary lifestyle, but 2,600 calories per day if his lifestyle is very active.
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