Does my Battery Really Need Replacing?

I have a MacBook 13" (early 2008) that I bought sometime in the middle of 2008 and so is about four years old.
It works perfectly well. The battery still only takes a couple of hours to charge and I'm still getting four to five hours of life from it. I use it on battery power frequently and try not to leave it on the mains too long (after charging). I also calibrate it about once a month.
However despite all that, I'm told via my battery icon that my battery needs to be replaced soon. The only strange behaviour is that it doesn't always know it's fully charged. If I charge from near empty or empty (especially during calibration), it reaches 99% charge in the usual time, but then stays there permanently (with orange charge light). But if I take out the power and put it straight back in again, it instantly registers as 100% fully charged and I get a green light. Other than this, I haven't noticed any other unusual behaviour, and as I stated before I'm still getting excellent battery life out of it.
So my question is simply, do I really need to worry?
Thanks.

Check out this article on preserving your battery for as long as possible:
http://moukisfashion.blogspot.com/2012/10/lifestyle-how-to-preserve-your-macbook .html
I think I saw somewhere that you should change your battery every 2 to 4 years.

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=====================================
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=================================
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=================================
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<Edited by Host>

Welcome to the Apple Support Communities
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