Summarize the following:
Looking overly made up can actually make you look older, so aim for a minimalist, fresh makeup look. Apply a light tinted moisturizer and a small amount of concealer to hide age spots and dark circles. Make your eyes look bigger (and therefore younger) by curling your eyelashes and applying a black mascara. A soft rose color on lips and cheeks will give you a youthful glow. Coloring your hair will not only cover grays but also brighten your look, particularly if you opt for a lighter shade or soft, natural highlights. For the best results, visit a salon to have your hair colored. If your budget does not allow for a salon experience, purchase a semi-permanent, ammonia-free hair dye at your local pharmacy, which will allow you to practice coloring your hair and experiment with different shades with less commitment. Semi-permanent hair dye will generally last for several washes, depending on the brand and the darkness of the color you choose. Yellowing teeth are a part of aging and will make you look older regardless of whether you have youthful skin and style. Invest in whitening toothpaste with enzymes and micro-abrasive ingredients, or talk to your dentist about more intensive options like bleaching. In addition, cut back on things that can cause tooth discoloration, such as:  Coffee Tea Fruit juices Cigarettes Soda Red wine To stay looking younger after 40, concentrate on buying clothes that fit well and complement your body rather than following trends. Go for classic, tailored pieces (e.g. a simple, sophisticated black blazer and fitted white shirt) and leave behind more casual, carefree attire (e.g., beach inspired t-shirts and shorts) which may appear inappropriately young and highlight your age. Avoid any clothing that is too loose or too tight, both of which can age your appearance.

Summary:
Use minimalist, youthful makeup. Color your hair. Whiten your teeth. Invest in a better quality, better fitting wardrobe.