I'm 45 and I dye my hair.
On me it looks absolutely fantastic. I'm not a trim 6-pack 20yo, and I even have a little chubby fat. But my hairdresser is amazing, he colors and cuts my hair like no one else, this guy could work wonders on Hollywood actors, but he chooses to help out regular Joes instead.
I've noticed that people are wondering what I've done to myself, they can't quite place it, have you lost weight? You look so much younger, waow..you haven't aged a bit etc. Some do spot that I've colored my hair, it's those at work who see me on a regular basis, but no one else can tell really.
The trick is - a really experienced hairdresser! Plus, you should never dye your hair with other than your original color, and absolutely NOT if your hair is totally white because then everyone will notice and it'll probably just be tacky.
And it's expensive too, because you got to keep it up, it takes maintenance and money, miss a cut...and everyone will know.
I look at my older pictures from when I was younger, it really is a perfect match, I'm one of those lucky that doesn't have any wrinkles in my face yet. When that time come, I may choose to just let go, but I'm certainly going to try to cheat inevitability as long as I can get away with it.
Those who are complaining about age discrimination is absolutely right, we live in a very shallow society, besides...it tells something about that person, the life, the want, the vigor.
When I didn't dye my hair, I looked worn and grey, and people talk with me for 5 minutes tops, when I started to "look younger", people wouldn't even let me go. I got a LOT more work assignments than before.
But the opposite is also true, beware of the fact you'll lose a few privileges if you pull it off as well as I do, for example - people don't treat you with the elderly dignity that you'd normally get, such as people holding doors open for you, walking off the sidewalk for you, you just get treated the way anyone else will be treated. I prefer that!