It varies dramatically. A few men will have a thick mat of chest hair before they are 18; other men are relatively smooth-chested in their teens and 20s and then develop a lot of chest hair in their 30s. Typically, however, you should have a sense for how hairy your chest will be by the age of 25 or so.
It just happens dude!
Chest hair growth is controlled by hormones and genetics, so there isn't anything you can do to promote or inhibit it. You can of course shave, trim, or wax unwanted chest hair.
None; chest hair and body hair are determined by genetics and age and by nothing else. If the adult men in your family have chest hair, then you probably will get some too--though in many men chest hair doesn't grow in, or grow in fully, until their 30s.
Unfortunately chest hair growth/pattern has to do with genetics and nothing else: there is nothing you can do to get more chest hair to grow, and the only way to reduce chest hair permanently is electrolysis or laser hair removal. Most men don't realize it, but their body hair keeps growing in throughout their 20s; if you are genetically predisposed to have chest hair, it might start growing in when you are 16, 25, or 30. It just depends. Men with light chest hair in their teens and 20s may find in their 30s that their chest hair gets denser or more widespread. The best gauge is to look at your father, brothers, grandfathers, and uncles: if they have chest hair, you probably will too.
Shaving the finer hair on your forehead is unlikely to encourage the growth of a widow's peak or alter your hairline significantly. The pattern of your hairline, including whether you have a widow's peak or not, is largely determined by genetics. While shaving or trimming the hair on your forehead may give the appearance of a cleaner or more defined hairline temporarily, it won't change the underlying structure of your hair follicles or promote the growth of new hair in a specific pattern. If you're interested in changing your hairline or creating a specific look, such as a widow's peak, it's best to explore hairstyles, haircuts, or styling techniques that can help achieve the desired effect. Additionally, consulting with a professional hairstylist or barber can provide valuable guidance and recommendations based on your hair type, face shape, and desired outcome.
Because "hair" is hair ... and having lots of chest hair makes for a hairy chest.
due to their extreme chest hair growth it sometimes spreads to the nipple area.
One of the more reliable ways to grow chest hair is to increase your testosterone levels, an option that needs to be discussed with one's doctor. Another weird method one can try is rubbing a cut onion on one's chest, which works because the sulfur in the onion stimulates hair growth.
One of the fastest ways for someone to remove their chest hair is to have their chest waxed or either to wax their chest themselves. Chest hair removal can be quite painful.
chest growing-hurts when it hits something or running/jumping, discharge, pubic hair, under arm hair, period, and growth spurts.
Your mom's chest hair.
Men sometimes lose chest hair