Your third reference spends most of its time supporting Michael's point, in much the same language. "In fact, Mr. Simonton found that mathematicians make their

Your third reference spends most of its time supporting Michael's point, in much the same language. "In fact, Mr. Simonton found that mathematicians make their best research contributions (which he defined as the ones mentioned most often by historians and biographers in reference books) at what many might consider doddering old age: 38.8. That age is very similar to those he found in other sciences: 40.5 in biology, 38.2 in physics, and 38.0 in chemistry."