A man's fashion is going to change, by virtue of his role in life and his budget, whether he wants it to or not. Over a long enough lifespan, you'll also see fashion standards change fairly dramatically -- think about what twenty-somethings tend to wear today, versus what they wore fifty years ago. Plenty of men who were twenty in 1963 are still around, and they've seen a lot of change since then!So to some extent you have no choice. But it's also worth a man's while to think about his age and how he can dress to flatter it specifically. Some looks just work better with a young face, or with gray hairs. Men's Style - In Your Teens and 20sThe first adult years are generally not a time of custom clothing and high fashion, apart from a lucky few born into wealth. Most men are going to spend their teens and 20s wearing whatever they can afford. That generally improves as the age range wears on -- guys in their late 20s typically have a lot more disposable income than guys in their early 20s, though there are obviously plenty of exceptions there.