I believe he said he got close to 1000ng/dl naturally, which I consider on the high side based on lab ranges. 400ng/dl is actually interpreted by some doctors as low depending on symptoms even though it's "in range".

Ah yeah, sorry, the 1024 was definitely on the high side for me, but I thought you were referring to the 400

Yeah most of what I read seems to indicate you should be on the high side in your early twenties but ultimately if you are at 400-500ng/dl and you don't have symptoms that is probably normal for that person.