Q

Do my feet keep growing in size as I get older as an adult?

Although the bones in the foot reach maturity and stop growing after late teenage years, your feet may indeed increase in size.  How can this be? It is because as time goes on, the ligaments between the bones tend to stretch out, due to hormonal changes, weight gain, or changes in gait.  Therefore, as the ligaments stretch between the bones, your foot size increases.