As you age, the range of motion in your joints decreases. This is particularly common among people who are older than 70, but everyone loses range of motion at different rates.
The good news is that you can keep your joints flexible through activities like strength training and stretching. Staying flexible will lessen your risk of pain and injury. It also makes it easier to perform day-to-day activities, like bending down to tie your shoes. Follow the link to learn more.