Have Firmer Skin Forever

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Use retinoids and peptides at night

"They're both proven collagen boosters and will accelerate cell renewal," Dr. Grossman says. "Go with the strongest retinoid you can tolerate, whether it's prescription-strength or over-the-counter." Rx formulas come in different intensities but generally move up in strength from Retin-A to Differin to Tazorac. "To minimize irritation, dilute the formula with moisturizer," Dr. Grossman advises. "Or use less frequent doses and work up to every night."

When you slough off skin cells, repair treatments can sink in more easily. Look for mild scrubs with ultra-fine beads. Or try a gentle-yet-thorough electronic cleansing brush.

Next: Firm up eyes, chin, and neck