Most people think as glitter and sparkles more of a Christmas thing or only on special occasions. That doesn't get said in my mind! I would wear glitter and sparkles all year through, no reason would stop me.
Or maybe you've been told too many times that you can't wear glitter as you get older. Put it this way, don't listen! There are all sorts of different ways to wear glitter, it doesn't have to be extreme glitter pigment as you may be thinking, there are pearlised shimmer that are already put into basic eyeshadows and also reflective glitter that is noticed within different lights which doesn't look to over the top.