Monday, May 6, 2013. I started saying I was middle-aged when I turned forty and that was twenty years ago. I still feel middle-aged but now the idea of Old is starting to creep into my consciousness. It was like that in my late thirties. I was constantly thinking about the middle-aged thing as thirty-seven turned to thirty-eight, and then flipped over into thirty-nine. When should I start calling myself middle-aged, what should I do about it? Saturday, December 1, 2012.

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Mathematics for Engineers and Economists. We hope to create a culture for opening and sharing and equip the participating faculty with teaching skills that they can also share with others in his or her institution. And other terms of use.