At what age do kids usually stop getting corporal punishment from parents?

I grew up in the 1950s and 60s. Most of my friends were spanked until the age of 14 or 15; it was confirmation that was the turning point. Maybe 10% of my friends were like my sister and I still spanked after the age of 14/15. My mother wisely believed that our behaviour and not our age should decide if we should be spanked or not.