An unexpected surge in sales of fashion magazines aimed at men in their 30s and 40s has taken the magazine industry by surprise. Bucking the general downward trend in sales for print magazines, titles like Leon have been getting snapped up by style-conscious guys over the past two years.

According to the National Publication Association’s Publishing Research Institute, sales of men’s magazines for the 30-40 age bracket began to rise around 2010. Sales of these magazines were up a whopping 38.3% from Jan. to Nov. in 2012 compared to the same period the previous year, climbing from 2.66 million copies sold in 2011 to 3.68 in 2012. Just five magazines fit into this niche market, with Leon taking the largest slice of the market share, accounting for a third of sales. The other magazines are Oceans, Uomo, Men’s Ex, and 2nd.

Though Leon was responsible for creating the concept of the “choi waru oyaji” — which roughly translates as “bad-ass middle-aged dude” — personified by fashionable middle-aged guys like Italian heartthrob Panzetta Girolamo, this does not appear to have been the trigger for the trend. It’s more likely that the recent women's magazine concept of the “ikedan," or cool husband, has inspired women to buy men’s magazines for their husbands in an effort to get them to improve their appearance.