Sorry, I had to sign up after a long time lurking just to reply to this - ageism aside, this is completely incorrect from my experience. The older, more experienced developers I know (I sit somewhere in the middle of the age spectrum myself) are typically the most detail oriented, having already learnt the cost of half-assing it.
I don't want to be negative about any other group, so I won't go down the road of "if anyone's likely to be sloppy and ignore the details, it's XYZ...", but what I've witnessed in my career (even if anecdotally) is completely contradictory to your post.
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