you lose long time concentration capability, a must to avoid silly mistakes in programming.
Based on my own experience, I'd say that's nothing but hogwash. I'm constantly correcting coding mistakes made by younger developers; the type of mistakes that lead me to believe they have practically no attention span at all.Now if you would have said "Getting old you get more back pains, more neck pains, and have a harder time sitting at a keyboard developing for hours on end", now THAT I would have to agree with.
Mark.