Swimming is a popular with people of all ages. From toddlers taking their first swimming lessons to retirees doing water aerobics to keep fit, everyone loves a dip in the pool from time to time. You might be surprised to know that there are more people who cant swim, than there are who can. That's right, about 35 out of every 100 people actually know how to swim. The most popular age group of swimmers are children ages 7 to 17.