Does this have a translucent base or is it opaque? I'm looking for a glass-like finish and have more mature skin.

If you're looking for a colorless glassy shine without glitter/sparkle, try Haus Labs Moonstone. Don't let the chrome silver shade scare you, it has almost no back pigment so it's your skin glowing, not a silver metallic color. It's stunning on my 46 yr old combo/dry porcelain skintone!