Can I achieve an hourglass figure through liposuction if I target the stomach? What's the legal age for lipo in the UK? (photo)

Thank you for your question. Based on your photos you appear to be a good candidate for full boy intense liposuction improving your body contour and get better curves especially in your laterals and waist. and a Dominican butt lift  transferring the fat that we get to your butt molding and improving your gluteal volume and projection. The legal age is 18.
Respectfully,Dr. Emmanuel Mallol Cotes.-

Your expectations are very high and perhaps unrealistic.  While Liposuction might improve your body shape, comparing yourself to celebrities may prove to be frustrating for you.  Remember these people have carefully crafted public images and most if not all of their photographs are heavily edited (Photoshop) to remove imperfections and require approval from their marketing teams.  Focusing on your own situation through diet and exercise will help you realize that a healthy body is fat more desirable than the photoshopped images that can never be attained.

I would recommend getting on a weight training program to firm your arms, legs, and thighs. Also, I would recommend eating mainly fruits, vegetables, not French fries, and meat. Stay off sodas and sugars, breads, and sweets. At your young age, you can do a lot to help achieve the look you want. After eating properly and exercising, if you have too much abdominal fat, go visit with a board certified plastic surgeon when you are 18.