Is a facelift appropriate for a young 24 year old patient if they lost an extreme amount of weight (150lbs)? (Photo)

From your photos, it does not looks like a facelift at this time would benefit you. An in-person consultation with assessment of your skin laxity would be necessary to know for sure.
Consider doing skin resurfacing and collagen boosting technologies to keep skin thicker and more youthful. CO2 laser, RF microneedling, etc.

Congratulations on achieving such significant weight loss
Losing weight does result in less volume within the facial fat compartments, and can contribute to signs of aging.
That said, based on the concerns listed, facelift surgery would only be able to help address some of them.
The facelift typically targets the lower face, jawline, and nasolabial folds.
The forehead is addressed in browlift surgeries as well as non surgical modalities.
The area around the eyes (peri orbital) is typically treated with blepharoplasty surgery. If the bags under the eyes are noticeable this can be a very effective surgery.

Particularly in men the mid face over time faces more fat atrophy than in women at the same stage of life. Fillers or fat transfer can be considered in these cases as additional procedures to help address soft tissue or fat pad deficiencies if they exist. This can be as a complement to a facelift, or on its own.

I would not be able to make a recommendation for facelift surgery in your case based on the photos provided here at this stage. However an in person consultation with a board certified plastic surgeon would be worthwhile to help explore your options.

In terms of droopy lips- an upper lip lift can be considered as the distance between the nose and the upper lip increases with time. I don't think he yet meets criteria for this intervention. He still has a relatively youthful distance based on the photo provided so I would advise him to wait for that.

Congratulations on this inspiring health journey.

Congratulations on your weight loss! No, a facelift is not the best option at your age. However, you can get good results with a treatment called Secret which is micro-needling with radiofrequency to thicken collagen, improve your skin's texture and tighten your face and neck with no downtime. It is 3 treatments done monthly.