I'm 62 and find that docs want to poke and prod a bit more because of it. Last year I had a scare when the doc thought I may have an abdominal aortic aneurism. After an ultrasound showed no problems, the doc shrugged his shoulders and said that that my belly was too flat - he could palpate things on me that on others were more difficult, i.e. through significant layers of insulation.