You used to be able to easily spend a day shopping in a pair of sky-high heels, but it seems to get more and more difficult with the years? It probably doesn't just seem that way.
The older you get, the thinner the fat pads under the balls of your foot and heel become. That makes walking in heels a lot less comfortable. In some cases you can even suffer from it with flat shoes. Do you often wear heels? Then your body can adapt by making extra calluses.
Were you able to walk longer in heels in the past?