I can't repair damage to them
You can freshen up and brighten almost any cabinet with a good scrubbing and some inexpensive paint.
Paint and new hardware are great ways to refresh old cabinets.
Scrub with some dawn and then oil them with lemon or orange oil or Amish wood milk
Could you paint them?
How are the cabinets damaged?
Please post a picture.
Without first seeing the problem, it is hard to give realistic suggestions on how you might make some repairs.
If paint is an option, it's a great way to refresh them. https://www.youtube.com/watch?v=JHqs8G01cUA
I used a kit by Rust-Oleum called Cabinet Transformations to paint my cabinets. You can see how I did it here: https://www.flippingtheflip.com/2015/09/kitchen-cabinets-black.html