We take pretty much any given analog camera, of course the older it is the more complicated it might be to fix since the parts might be more worn out, or rusted. The good thing is, with old cameras pretty much everything is mechanic so it means that it can be fixed manually!
If you camera is highly popular it’s probably gonna be easier to find replacements for it, if you have a very unique model it might be more difficult. But most of common issues they can be fixed with a CLA or replacing worn out parts.
When it comes to lenses they all have a similar way or being stack up together and glass is glass no matter the years that has, there are a serie of common issues such as fungus, humidity, dust, scratches etc… some have a better solution than others but it’s usually pretty straight forward.
With electronic cameras (also compact cameras) can be really tricky to fix since they fully depend on electronics and it’s often difficult to find replacements for them.