At what age would this person's comments hold water? 25? 28? 30?
When someone is talking about fashions or the popularity of new technologies etc, then being too old is going to make your opinion less useful as it's going to be harder for you to unlearn what you've already learned. This is generally far less of a problem and I really haven't seen much "This person is too old" on HN, but you do see it a lot on reddit as reddit attracts a very young crowd.
Young coders don't have that much experience yet and will often have to rely on their brawn rather than their wit which could perhaps make the 60+ hours thing a solid strategic choice.
As I've grown older I've found that I can deliver much more value with much less effort by being well rested and taking a step back to see what's actually the important thing to do.
Whether I'm doing so because I've become wiser or because I've become less effective in those long hours is a different question altogether of course.
39.