What's the best treatment for mild, genetic droopy cheeks?

Hello, thank you for your question. It seems like you can benefit from Buccal fat removal, this is a good option to contour the face. Buccal fat excision can be done comfortably, awake, under local anesthesia in under an hour. The results are long lasting and the recover is quick. I recommend you to schedule a consultation with a board certified plastic surgeon for proper evaluation.

Thanks for your question and Pictures
The buccal fat pad is a rounded mass of fat in the middle of your cheek. It’s located between facial muscles, in the hollow area beneath your cheekbone. The size of your buccal fat pads affects your face shape.
Everyone has buccal fat pads. However, the size of buccal fat pads can vary greatly.
If you have larger buccal fat pads, you might feel like your face is too round or full.
You can be a candidate for a Buccal Pad removal surgery.
Best of Luck

You are young and the elasticity should help the skin contract. Adding volume to strengthen your chin or jawline may help too.

Buccal Fat Removal is a good option for slimming the lower face and enhancing the chiseled look but will not help or hurt with skin drooping.