What is the point in being coy about your age when your wrinkles give you away?!?

Why do some people (mostly women) not like telling people how old they are?

Someone at work decided they were going to ask people when their birthday was but were sure to clarify that they didn't want to know the year people were born as most don't like giving out that information.

Here's a newsflash for you: Most people already know roughly how old you are. The wrinkles on your forehead give it away. If you're past a certain age then it's unlikely your neck looks like that of a spring chicken (probably more of a turkey to be honest).

It's not like you're going to tell someone you were born in 1965 and then have them faint in shock as they thought you were 17!

I suppose it works the same with weight. If someone told me they weighed 400 pounds, it probably wouldn't come as a surprise to me that they were fairly hefty. There would be other clues I'd like to think I'd pick up on first.

So what is the big deal??