You look well

When you meet up with a relative or a friend that you haven't seen for a long time and they say to you. "You look well ". What do they mean? Is it a polite way of saying " you are a bit fatter than last time I saw you ". Or you are more wrinkly than I remembered" Or do they really mean that you do look well. This of course could be the case. If they genuinely do think you look well then I think. What the hell did I look like before. Did I look Ill before.Did I walk or smile in a crooked way and now I am better and didn't know it. Mmmm I wonder eh!.