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From browsing the article. It states that this is NOT an illness getting to folks 50 or older. It states that being overweight may be a factor in whether it is fatal.

One such potential new risk factor is obesity. An early study from the U.S. Centers for Disease Control suggested it may be contributing to poor outcomes in people who contract the new H1N1. The WHO is concerned about that possibility. "Obesity is now a huge global problem," says Dr. Nikki Shindo, an expert with the WHO's global influenza program. "And if obesity is a risk factor, then I would be very much worried about some of the populations that are living with obese conditions."

I would guess WHO is concerned about those with Gross Obesity.

The Article confirms that doctors believe that H1N1 strikes those hardest with underlying conditions.