All good advice above!! California can get dry, especially in the central valley area. Some people keep their guitars in cases, and for that a case humidifier or soundhole humidifier will work well. Some people seem to think that a guitar that isn't' being played MUST BE cased. I'm not in that camp tho. I like to see them and if I had to uncase and recase every time to play them, I'd play them less.
I struggle these days as I live in Las Vegas, NV now and having them out on stands means an AREA has to be humidified for them. That's what I use our atrium for these days. Enclosed in glass with moderate temps and a Kenmore humidifier struggling to keep the humidity between 40-45%. So it looks like this:
You can see a tiny bit of the humidifier at the middle right of the photo.
Now guitar polishes are fine, but I have little use for them. Lacquer and poly finishes (I have both) are fairly durable and shiny and require little effort from me. When I change the strings, the entire guitar is cleaned with distilled water and a soft cotton cloth, and then polished with a clean dry one. This works just fine for me. Just a tiny bit of Bore Oil on the fretboard and bridge let it sit for a bit, then buff dry and you're good to go. I rarely if ever use polish. When I do use it, I use Virtuoso Guitar Polish and also the Guitar Cleaner. Go easy with them. And as has been mentioned, don't use furniture polish or anything with silicone in it. It can screw with glue joints and refinishing (if ever needed) will be impossible.
Now, you have an older guitar which is 50 years old. Not sure what shape it's in, but over time from contact with humans and life, guitars get dirty. And maybe has been polished before and there may be residue. If the guitar needs a really deep clean, you can use a solvent called NAPTHA which you can get at Home Depot or Lowes. It's safe for lacquer and poly finishes and dissolves the schmutz of life, dirt, polish, sweat, everything. Use quickly and sparingly, then follow with the water and polish dry. If it's been kept clean and nice, you probably don't need this step.
So that's my input. Depends on how you store your guitar, and what kind of shape it's in. You say it's "beautiful" so maybe just a light wipe down and you should be good to go. Virtuoso can be purchased online if you're desperate to polish. Mostly, though, I'd use distilled water, and soft dry cotton cloth.
