I have a memory - although maybe a false one - of my sims being able to see themselves in mirrors, once upon a time. Certainly, in all the pictures of downloads on this site, the mirrors appear to be fully functional... by which I mean reflective. The mirror-related actions (admire self, and so forth) work fine, and always have, in my game. But the mirror surfaces are just gray. The issue appears to also be true for the one-way mirror windows: they're transparent from the back side like they're supposed to be, but the mirror side is non-reflective.
Did I do something wrong? Is there a crucial file that I've deleted by accident? Are my graphics settings too low? I know this is a minor concern, and it may be a blessing in disguise for my graphics card (my laptop - a MacBook Pro, BTW - sometimes heats up like a frying pan) but it's puzzling me. What can I do to get the shine back on my mirrors, and is it advisable to even try?
Cheers.

Mirrors are certainly affected by your graphics settings, I forget what exactly, I have had to turn reflectivity on and off for pictures at times myself.
So, try altering the in-game settings first. Good luck!

@chitownriverscum have you set reflections "on" in your game graphics config tab?

Sounds like you have reflections turned off, probably to help stop your laptop overheating.
Options looks like 3 dots on the UI. Under there are Graphic Performance Options button that looks like a monitor. Inside that to the right is Reflections on or off.

@chitownriverscum here is an image of its location, in my spanish version says reflejos but the location is the same, set it to on and apply. (here it says Si)