Younger customers are at the forefront of the boom in air fresheners, which have grown up since the first Airwick and Glade sprays hit the shelves two generations ago. “The teenager today is purchasing what prior generations have looked to buy when they became young career professionals,” said Marshal Cohen, chief industry analyst at the NPD Group, a retail research company. “Younger consumers are much older today, in terms of what they’re buying.” About a third of teenagers with scented air ...