Mine are showing some signs of aging. Are the lens covers replaceable? Aftermarket suppliers?

input is appreciated.

 

They need to be restored / polished. It's a DIY or you can pay someone to do it. Look for headlight restoring. ....

 

ok. ty CitadelBlue. I will look into that.

 

I have always used the Mother's headlight restoration kit. It is about $30 at any auto parts store and works awesome. Here is a picture of a civic I used it on a few years ago. Here is a before and after (took about 15 minutes per headlight):

 

You could diy it by yourself. It's not that hard. Just wetsand, compound, polish. Some people have put clear coat on but if you decide to do that, make sure it has UV protection in it or it will go back to yellowing over time.