Wait long enough and most of us will learn how to achieve silver hair, the only problem is that for most of us our hair won't be a pretty, uniform silver color. Most people will have areas of silver and areas of some other color, maybe a few other colors.
Many people will cover their silver hair at first. They simply think that it makes them look old and they feel that they are too young to look that old. But in time, a lot of folks will realize that silver actually isn't such a bad thing.
One of the greatest sex symbols of our time, Richard Gere, has had silver hair from a young age. Of course, women will argue that some silver is ok on a man, women will still find him attractive, but silver on a woman is a turn off to men.
That unfortunate double standard may or may not be true, I don't know, but at some point most people simply get tired of having to color their hair and they want to let it go natural. Of course, the problem then becomes what to do if you hair isn't completely silver yet. You don't want to look like a patch work quilt.
For most people the best thing to do when you start getting quite a bit of silver gray in your natural hair color, but not quite enough to just let it go natural, is to go to your salon and have them dye your hair a beautiful silver / gray color.
As with all hair coloring, if it is not done properly you will end up with a flat, dull monotone hair color that is not only unnatrual looking it's also not attractive looking.
If you look at hair, no matter what color, it usually has several shades or highlights that make it shiny and "bright" looking. This effect is hard to achieve on your own at home, especially with silver gray hair. It's best to rely on the professionals so your hair color is attractive and not dull or old looking.
The best thing to do is to determine a "start date", figure out when you are going to stop dying your hair the color it used to be, or the color you wished it had been, and transform it into the natural silver gray color it is becoming. There may be some time between processes where your hair won't look that great.
Once you have the older color out, either by growing out or by cutting it short enough that it's out, you can go to your hair stylist and have them apply a pretty silver/ gray dye to your hair. This color will most likely be easier to maintain than the color you were using before if it is closer to what your natural hair color is.
The closer to your natural color the less noticeable the roots will be when it starts to grow out. That means less frequent hair colorings to "blend" the look (and that means less time and money on a hair stylist).
So, if you want to know how to achieve silver hair you basically have two choices: you can get married, have kids and wait, or you can go to see your hair stylist and have it colored! It's up to you.