I am 50 and wear products that sparkle.

I personally think it is A-OK to use shimmer products on mature skin. The key is to not wear them all over the face at the same time. I am most likely to use them:

• On the lids of my eyes. If your eyes are round like mine, you will see it even if they are open.
• As an eyeliner. A pencil or a shadow, applied wet (less fall-out) with a brush.
• On my cheekbones. A blush/bronzer or illuminizer/highlighter.
• In lip color. Lip color, even bright ones, look a little softer with some reflection. I am not talking glitter but matte can be dull and emphasize the imperfections and asymmetry of lips, generally being less forgiving of a quick and dirty application. (Is there any other way, most of the time?)
• When I am feeling sparkly; on the water or shore, at a party or a concert.

These particles reflect light bringing light to our faces and our mood. Just go easy and keep in mind that you will sparkle more in the sun.