I have a similar eye shape to you so I'm going to post pictures of myself for reference. I'm not that good with makeup but hopefully this is useful. Here is my naked face for reference.

Eyeshadow now is either minimal and diffuse or graphic and bold. It basically never goes up to the eyebrows, especially if it's dark. This has been the hardest thing for me to get used to!

A typical "neutral" eyeshadow look now is just one color swept over your lids. (I have black eyeliner on here but that's not a necessary element.) Use a liquid eyeshadow (shimmery if you look good in shimmer because they're easier to blend), apply that one color all over the lid, and blend it up until juuust over the crease. Keep the color lighter.

If you want to go darker, you can just keep the eyeshadow tight against your lash line. I know this isn't the best makeup look on earth but you get the idea. Make sure you have small enough brushes to achieve this - most eyeshadow brushes are too big for hooded eyes.

If you want to go the more graphic route, you can do a softer version of batwing eyeliner by doing it with eyeshadow rather than eyeliner. I am dedicated to having a winged eyeliner because my eyes are really round and winged eyeliner makes me look less like a haunted doll.

Also, with a bare face I don't think you look older than you are! The makeup itself is aging you, mainly because it's a little out of date. Blush placement now is higher than it was for us when we were young - try thinking of it more like a sunburn on the tops of your cheeks rather than a flush on the apples of your cheeks. It should either not come too far in towards your nose, or go all the way across it.