'Older' in the Bible

After the child had grown older, she brought him to Pharaoh's daughter, and he became her son. She named him Moses, because she said, "I drew him out of the water."

All who are registered, 20 years of age and older, are to give a contribution to the LORD.

a beka a head (a beka is half a shekel, according to the standard used in the sanctuary) for everyone who went through the registration process from 20 years old and older. The total numbered 603,550 bekas.