I'm currently 39 years old with a (saggy) C Cup. Would I be a good candidate for a breast lift without implants? (photos)

based on these photos, you are excellent candidate for breast lift. You may expect to be slightly smaller than current size but is will look good on you. Good luck.

As long as you are ok with your current cup size, you can do a lift alone. This will naturally lift the breast above your lower breast fold, raise and centralize your nipple on the breast mound and make the areola smaller, which will look quite nice. Realize that permanent scarring is the trade-off and the final contours will be tear drop shaped. There will not be a lot of upper pole fullness you normally see associated with breast implants. But if you are ok with a natural contour, you will be pleased.