[Vegas Street Rider]

I have been contemplating changing out my chain. I have over 15,000 miles on it and chain adjustments have become more frequent. I can't really see any wear and tear on my sprockets and the alignment notch is still in mid range of the markers. It seems to run pretty quiet too. I have always used a dry teflon lubricant and it looks almost new. I ride in a pretty clean and dry environment here in Vegas. Any thoughts?