I think that it's actually when the earrings are larger that you can truly tell whether they are fake or not. In my experience, .25 carat total weight CZ's, especially if they are clean, you really can't tell that they aren't real.However when you get to the sizes like 1.5 carat total weight and up, the fake czs get very obvious. they have that white windowy look and it looks really bad.
Many around here wear enormous fake czs, it's in style for some reason, especially for teenage boys to have giant czs.
I have earrings about 2 carats total weight, H color, VS clarity, H& A. When I first got them I worried if people would think they were fake or not,but now I don't really care. I enjoy a lot of things about them but one of the things I enjoy most is not having to constantly clean them, like when I used to wear CZs. That is, of course I clean them, but with the CZs when I used to glimpse myself in the mirror I'd be frustrated and wipethem off. Now, when I glimpse my diamonds, they always look great andlook real.
I hvae no idea if I have large or small earlobes, I just knew this was the size i wanted so i picked them out when my husband wanted to give me a special present. For twenty-five years before that, I had .05 total weight diamond studs (which I also liked, because they were also a special present). I think that you should enjoy your things and be grateful if they are a gift from someone who loves you or you worked hard and can afford them without debt. I don't see that your age has anything to do with this at all. If I was twenty and had these earrings, I would still wear them and enjoy them. These are the size I like (no upgrades are planned) but if someone else likes 4 carat tw. or 5 carat total weight,I think they should wear them all day if they want, every day--just make sure that you get those earring backs that prevent them from drooping and tugging your earlobe down.