Well, part of what's up with HP fandom is that there isn't really any such thing as HP fandom as a whole. It's so big that you can easily exist for years in one corner of it without ever even hearing of the BNFs in another corner of it. Yes, certain characters and pairings have a high percentage of younger fans - others not so much. The 'Cult of Snape' corner of the fandom, for example, tends to include a lot more older fans than the Harry/Ginny OTPers.
In my experience, the people who write the good HP gen mostly tend to write slash or het, or both, as well, rather than being specifically or even primarily gen fans. I've recced about half a dozen excellent gen stories on my recs page (http://luthien.ebonyx.org/docs/recs/recs.html), but kaiz has a much more extensive recs page (http://www.squidge.org/~kali/hprecs.html) than mine that includes an entire gen section.
As for current gen, A Year Like None Other (http://aalno.tauri.org/viewstory.php?sid=33) is the story I keep hearing about, though I haven't read any of it yet.
There are more out there, too. Really. It's just a case of digging in the right places.
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In my experience, the people who write the good HP gen mostly tend to write slash or het, or both, as well, rather than being specifically or even primarily gen fans. I've recced about half a dozen excellent gen stories on my recs page (http://luthien.ebonyx.org/docs/recs/recs.html), but
As for current gen, A Year Like None Other (http://aalno.tauri.org/viewstory.php?sid=33) is the story I keep hearing about, though I haven't read any of it yet.
There are more out there, too. Really. It's just a case of digging in the right places.