1)they darken,lighten,and roughly stay the same....many factors condition the appearance over time. exposure to direct sunlight will bleach color out of the finish but may also darken the wood beneath.i had a cello yesterday that was a dirty blonde color, or so i thought...under the tailpiece,bridgefeet,and fingerboard was a dark red hue that had been bleached out elsewhere on the top..must have sat in a shop window for a great length of time..nothing stays new forever but you shouldn't get a radical change either way for many,many years.i have a very old bass and it's color is a mix between coffee grounds and pipe tobacco. the inside is as dark as the outside.
2)the ques could also apply to the performer...as your playability/responsiveness gets better with age so will your instrument, you will find the weaknesses in both yourself and your setup.i wouldn't put much credence in or try to recall how it sounded 5/10 yrs ago..more so how it sounded tonight
