I'm not even that confident about obesity being a risk factor. Obesity rates in hospitalizations were often a little lower than the population rates (implying a slight protective effect instead of a risk factor), and almost all the reporting on it either compared "obese" to "overweight and obese" to massively inflate the apparent risk, or shared the obesity rate with no comparison.

Even assuming it was, it would only have been a fraction of a fraction of the risk from age.