Change of taste /color of Scotch
RL - The taste really should not change - not that much anyway. But if you're waiting years and years and years to drink it and depending on how you have stored it, can make a big difference. My personal preference is to drink my Scotch within a couple of years, but I do have some now for 6 - 7 years and I believe the taste to be the same.
Once the spirit is bottled, it stops maturing. The color is created during maturation and comes from the cask (wood) itself.