Do you have a spare pair Jean? If not I would get a second pair, and have new lenses put into your current pair. I always keep one pair of my old specs around just in case. I really kind of wanted to see those hectic D&C specs on you, so maybe I have an ulterior motive But beadbug definitely has a point.
5 years is a little short to replace them outright though. My mom's office generally recommends replacing your frames every 6-8 years depending on how often you wear them, and it doesn't seem like you wear these all the time, correct? The reason to replace them is that frames simply lose strength and elasticity over time. They tend to distort based on how you wear them--like if you take them off the same way every day, one of the ear pieces might bend out more than the other over time, and it gets harder and harder to adjust as the frames become more delicate and continue to be exposed to the same stress every day.
Vintage frames can absolutely be used, but they are more fragile than I think most people realize, and adjustment can be difficult. I had a pair of vintage sunglass frames a few years ago. When one of the lenses popped out and couldn't be found, I asked to have it replaced, but they told me the frames are way too weak and will probably crack. I did eventually find a place that would replace them, but not long after that, I dropped them and they shattered on a carpeted floor!
