It may be related to your gender, age, weight, height and your daily activity. Here is formula for your reference.
Male:[66 + 1.38 x weight(kg) + 5 x height(cm) - 6.8 x age] x activity
Female:[65.5 + 9.6 x weight(kg) + l.9 x height(cm) - 4.7 x age] x activity
A man that weighs 273 pounds at age 45 and is 5'8 in height needs a calorie intake of 2550 per day. This is for a man that lives a somewhat active lifestyle.
45-60% of your daily calories to come from carbohydrates 10-35% of calories to come from protein
In general, 45% - 65% of your daily calories should come from carbohydrates.Example:If you eat 2000 calories a day, 900-1300 calories (225-325 grams) of carbohydrates are recommended.
How many calories should a 63 old man intake daily
1500
2600 calories per day
The recommendation for carbohydrates is that they should be coming from 45-65% of the calories in your diet.
3
45% to 65% of calories eaten should come from carbohydrates, recommend a minimum level of protein.
Talk to your personal physician about this.
If you multiply the average man's daily value of calories (2,000) into a year, it goes to 730,000. So, on average, probably between 700,000 calories and 750,000 calories per year.
You should consume seven calories per pound to lose weight, so 1655 calories per day.