*Sigh* I'll never get those 3 hours of my life back.....Now, I want to give back to the GIMPTalk community that has taught me so much about the GIMP.
This Tut will show you how to make a photo look old, cracked, and weathered. I did a search and could find no such technique. So, I played around with some settings and then made this Tut with GIMP v.2.2.11.
First, open your photo with GIMP. Umm, make sure that you are working in RGB. Here is a picture of my daughter. I put a digital watch into the frame for some anachronistic irony.

In the photo's window open Script-Fu-->Decor-->Old Photo. I used the default settings except for the Border, which I lowered to 10. You should have a new copy of your picture, like this:

Looks nice and old, yes? Well, we're going to age it some more now. In the Layer window (CTRL+L) create a new layer. Name it 'Cracked Up.' Set the Layer Fill Type as Transparency.
Toggle your FG/BG colors so that FG=White and BG=Black.
The rest of the work will be done on the Cracked Up Layer. In the old photo's window open Filters-->Distorts-->Mosaic. Set the settings as shown below.

In the Layers window set the Cracked Up Layer Mode to Overlay. Move the Opacity Slider to 80. Lastly, open the Filters-->Enhance-->Unsharp Mask and use these settings:

Now, your photo should look like this:

It's a previously undiscovered photo of my daughter's great-great grandmother from the Old Country! The resemblence is striking.
I look forward to seeing your old photos. I also welcome any constructive criticism.

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