Any topical application alone (including essential oils) are not enough to tighten sagging skin, however with continued use, they may be able to improve the way it looks.
Old scars, even minor scars can be aging. Here is a formula designed to address scar tissue:
1 ounce rose hip oil
3 drops vitamin e
4 drops helichrysum (addresses scars)
6 drops Neroli (addresses scars and wrinkles)
5 drops Patchouli (aging skin, scars, wrinkles and sagging).
Apply at night after cleansing and toning. Follow with moisturizer