The color of glans penis is related to people's age, skin color, weakness and erection. It is normal that the color of glans penis will change with age.
In addition, the more sexual intercourse, the more intense the stimulation of penis skin, so the more melanin deposits, it will gradually become purple or even purple-black. In fact, melanin makes the skin stronger and is beneficial to the endurance of the penis.
As for whether it is still young, the color will of course be lighter and normal.