The fingernails are made up of laminated layers of a protein called keratin. These emerge from the base area of the nail under the cuticle. Please keep in mind that healthy finger nails give a smooth look and there is no existence of pits or grooms. Color uniformity is visible and the look is consistent.
There is a tendency for the nails to develop harmless vertical ridges. These run from the cuticle to the tip of the nail. As for the Vertical ridges, they tend to become more noticeable with age. White lines also start showing along with spots which is due to injury. However these eventually grow out with the nail.