Bathroom TIle Grout - How to make color the same?

My bathroom tile is 20 yrs old and the grout has darkened over the years. I just had about 5 % of the tiles re-grouted and the grout is white and naturally is different than the original grout. Any suggestions how to make them all look more alike - whiten the old grout or "dirty up" the new grout? If I should try to whiten up the old grout, what products work best? (my son-in-law said he read that the new Clorox pen is pretty good for the job).
Thanks in advance for any help.
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(Pardon the copy/paste from an earlier post :)
You can use grout colorant to change the color of your grout. It applies like paint, so it completely covers the existing surface, and acts as a sealant, as well.
I used AquaMix's grout colorant and sealant (http://www.aquamix.com/gc.htm ) on my grout about a year ago, and while it was a little tedious to apply, it really looks great. It comes with a kind of toothbrush applicator, but I found that a small angled paintbrush from the local craft store worked a lot better.
If you call their customer service, they will send you a free color sample chart, too.
Good luck!
-- Jennifer
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I was watching "House Doctor" (love that show) the other day and they used a ":grout pen". It is the same as the grout colourant mentioned, but came in an applicator that looked like a fat felt pen and put on an really even line.

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