Nowadays you do not need to wait until they are ripe. Modern methods and surgery make this concept irrelevant.
I was told that the time to have mine done was as soon as they impacted on my life. So the moment I felt it was affecting my driving I saw the optician and had it removed within a few months. The same, 5 years later, with my other eye, same problem - affecting my driving.
I had the same problem as Sar's DH and had 10 minutes laser surgery and haven't had any problems since.
Nowadays if you are short sighted or long sighted the replacement lens can be tailored to your prescription. My surgeon said he couldn't make my sight perfect, I was very short sighted, but I could choose to use to have my lens adjusted so that I only needed glasses for reading or driving. I chose to have driving glasses. After 50 years of wearing specs or contact lens. The joy of walking around without glasses and being able to see properly is still such a pleasure.