Made my first beer ever, Block Party Amber from NB, on Jan 15th of this year. Bottled it on Feb 7th. Drank a bottle on Feb. 21st. It was very good, not great, but very good. Served some to guests on March 12th, and they all raved about it. (I have nice friends, or at least ones that appreciate free beer.) I started a Bavarian Hefeweizen on Feb. 11th, and bottled it on March 3rd. Tried some on March 24th. Again, not great, but good. But as time has gone on both beers, instead of getting better, have gotten worse! Both of them now leave a strange flavor on the tongue after swallowing. From what I've read about oxygenation, and the cardboard flavor it leaves, I wonder if that's what's going on with these beers, because I can imagine that the flavor I'm tasting is kind of like cardboard. But I can't for the life of me figure out where in my brewing process oxygenation would have taken place. So is it just that I didn't drink this beer fast enough? Are both of these recipes beers that are meant to be drunk young? Does "young" mean within a month or so? Thanks for any responses.