Is my ass saggy? If so, how can I lift it up and shape it? (Photos)

From your pictures you do not seem to have any sagging in your buttocks. In fact, you seem to have a very beautiful shape as it is and I probably wouldn't change anything about it. That said, if you're still feeling insecure and there is something in particular that is bothering you about it, I recommend that you book and in person consultation with a board certified plastic surgeon to discuss all your questions and concerns and any potential options to get the result that you are looking for. It's always difficult to give a correct assessment from pictures alone.

Thank you for your question.Based on photos, you have a great shape  to the buttock area. It does not appear that you have any sagging. I would at this time, not recommend any surgical procedures. Squats are a great way to maintain the shape and position of the buttock.