What is the ideal age for a child to learn to swim?

What is the ideal age for a child to learn to swim? - A video on YouTube of a 16-month-old toddler who learned to swim rampant discussed in cyberspace. It was finally raises a question for the experts, the actual number of ideal age for children to learn to swim?"There is no rule how the recommended age for children to learn to swim. However one also if we assume that the child can automatically