I think your records age well. They're what I call "real music", made from real emotions (whatever they may be - in the case of BKM mainly joy and longing and masculine energy I guess) and exhibiting a joy at playing music.
I'm also reminded of Böhm Kalpen Maass when listening to my latest album discovery - The Blue Album by the legendary Russian group Akvarium. Even though the songs and the emotions are very different, there's the same sense of uncontrived expression and the joy of music.
I also like a lot of songs and album that don't have this quality, which I love for other reasons, but when you have this quality it's nearly always worth listening to.