As nails and skin become drier, you may notice your tips splitting. Twice a day, slather on a heavy-duty hydrator like Aquaphor; it contains petrolatum, an ingredient that "acts as a sealant to trap moisture," says N.Y.C. dermatologist Chris Adigun. In this decade, nail growth slows down, so adopt a flattering "squoval" shape and paint on polishes in elongating nude tones.Aquaphor Healing Ointment, $6; drugstore.com.
Sally Hansen Complete Salon Manicure in Almost Almond, $8; at drugstores.Read MoreLess