Few things in the world make a person feel old like watching a child grow from a newborn infant into an adult. Even if they're not your own kid or kids, the visual ride is pretty much the same.
Yea, my goddaughter is about to be 11. I was there when she was born. They put her on the scale to weigh her and she had a good grip on the side. The nurse tried to turn her towards the middle and she kept rolling over to grasp the side. About to be 11 now and talks like she's 21.