Old leaves naturally discolor, dry and wrinkle up. 5 or so at the same time seems to be more than usual.

But the leaves could be yellowing from overwatering too. Make sure the plant is in well draining potting mix and in a container with drainage holes. From the look of it in your photo, the soil is too peaty and wet (perhaps you just watered, but peat tends to dry up very slowly).

If my plant, I would repot it into more gravely mix. I also like to use topdressing of coarser gravel to keep leaves from touching the wet surface (usually not a problem with gritty mix).

Thanks! For a more gravely mix, would it be good to add sand? And we just watered two days or so ago.

No, no, no, no & no to sand, at all ever, it only causes problems. Do not use unless it's very COARSE &/or is labeled Horticultural Sand.

Only add perlite, pumice or other grit, nothing remotely sandy pls. or you'll be making things much worse.

Lena

Gil

as Lena said. I use grit+perlite+turface, would use pumice or scoria if it was easy for me to get (it isn't).

You could 'test' your yellowing leaves by gentle squeeze, they should be quite firm. If they feel very soft, the plant could be water logged. Haworthias don't need to be watered very often - mix should dry out between watering. The number of days in-between could wary according to your climate.

My plant has one side that was exposed to sun. It is under the lanai roof, but some sun peeks in around noon. The leaves turned yellow-orange. I have my plant in gritty mix and it is not over watered. It gets watered once or twice a month. Here's the leaves -

You can see the babies at the bottom and leaves at the top are white with no discoloration. If your plant is still firm, maybe it is sun exposure.