I don't think age is important at all. What is important is: do you fit what the company is looking for? I think in general, to be a great programmer, you have to be open to learning and be able to challenge yourself constantly.
That being said, I agree with what @DianFay says... younger people do have less commitment in life, and tend to be slightly cheaper labour, and easier to 'mould' in their eyes.
Yes, I agree, fit is more important.
However, when the position description restricts the age, you can't even appeal to that :(
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