I have been brewing for about 6 months and really like it. I have a citra pale ale and an IPA that were amazing 2-3 weeks after bottling. Huge hop aroma and flavor. Lots of grapefruit, citrus, melon, etc. It was awesome. Now the beers are around 4-6 weeks old and are definitely worse. They aren't bad but at their peak they were some of the best beers I've ever tasted. Now most of the amazing hop aroma is fading fast. The beers are fine and still fairly drinkable.
I have noticed that they have a cidery flavor which they either did not have before or I didn't notice it because of the hops. It's not completely unpleasant but it is a little weird because I didnt taste it before. None of my other beers have had this cidery flavor.
My best guesses are that:
1) The cidery flavor has always been there. It was fermented around 68F with US-05. Maybe this is too high.
2) This is actually a hop flavor I'm picking up. I have used US-05 at these temps for an amber and didn't get this flavor. The pale ale and IPA were dominated by citra hop flavor and maybe it's just "old" citra hop flavor as it ages.
3) This is caused by oxidation from aging of the beer.
What do you guys think?