If we have a meal at the Mozaik Bahce I could never manage a dessert as the helping are so big. However, I always feel guilty if I leave anything as the food is so good.
I have asked for a smaller portion but this does not work at all. We were in there for lunch one day with Jim and Helen Fraser and she asked for a child's portion and it was huge...
However, getting back to the subject, I would say that everyone has a different appetite and it does not matter your age. If you ask for a smaller in portion in most places you would get it. My Father ate very small portions, but loved a huge starter and big sweet, but he would have been mortified if we had of asked for a pensioners meal.. He did not want anyone to know his age. He was proud of looking younger. We just asked for a small main meal.