At what age do babies start walking?

It's a very individual Qs. My no1 start officially walking without support is about 14-15 months. My no2 can stand long ago about 9-10 months +. He can only walk without support bit by bit is 12 months old like a duck, 13 months old than he is walking more stable on his own. My fren son, 14 months, can stand and walk a bit with support but can't walk on his own yet. But he can stand well already, hence it's a matter of time. Don't worry too much, unless they can't stand on their own or stand with support than u need to seek help.