Your bike won't stay new forever. Maintenance will help of course, replacing worn parts will help, but ultimately it won't feel or sound new unless you replace the entire drivetrain at once and get it tuned perfectly. Oh, your derailleur may be slightly out of line, or the hanger has bent a tiny bit too. There's a little play in the brifters, cables have stretched slightly and maybe the housing has dried out.

I don't mean to be so downbeat, but my 5 year old carbon fiber "last bike I'll ever buy" is not so new anymore in spite of my best efforts to keep it in top shape. At 55 years old it doesn't matter to me that much as I'm not riding in the TdF, or even the local club races.

Edit: I just noticed that I'm approaching 3000 posts. Not as much as Hillrider or Operator, but I can't believe I've spent so much time on the forums. That's time NOT spent on the bike. As my injuries pile up, I'm expecting to ride even less. I just had the last of the 13 stitches removed from my lip (take that Mr. President!) from my last ride.