don't ever smoke, drink, do drugs, and use sunscreen in the sun, eat healthy, wash every day, moisturize your face. to stay young and beautiful on the inside, be kind, do random acts of kindness, don't use cuss words, and say your prayers.
Contrary to popular belief, youth and beauty are not mutually exclusive. Plenty if older women are beautiful. It's unfair that our culture puts a way higher premium on youth with women than it does for men, but the hell with our culture! Just take care of yourself, eat right, exercise, and don't sweat the little signs of aging. Most importantly, be a beautiful PERSON, and people will see you as such.