every year you age you need to reduce calories a day by about 10 or so. you can google calorie calculator and play around with that #
it isn't crazy much but obviously someone who is 50 will not be able to eat the same as a 20 year old
my advice is reducing restaurant food because there are a lot of hidden calories in their meals. butter and oil is a killer.. in my neck of the woods a lot of old people like to eat out like all the time, they just get too lazy to food shop and cook and that is not good