I also would suggest waiting.. even if they are stained or aged looking, I wouldn't want to risk distortion or fraying and then not be able to use them.
IMHO stains wouldn't matter, they would just add to the over all look. I might even tea splotch some fabric to match :D:D:D

Wait until it's a quilt....don't wash!

Unless they were truly disgusting, i wouldn't wash them.

I wouldn't wash them either. at least until they are quilted. I would very nicely tell her that it could ruin them more than help them. post pics when you get the blocks or the quilt done. can't wait to see them.

I would wait till its quilted , but if it necessary I would just hand wash gently and lay out flat on a towel to dry.

I would wait until the quilt is complete.

Pics please when it's finished!

thanks everyone thats what i decided too.I will post pictures of it when im done,and this is for her(someone asked),she asked me if i would make it after I shoud her some quilts i finished

You have received good advice. I' have not experience with old blocks or quilts. Good luck.

I would soak them in a flat pan with some synthropal in the water, work up and down with my hands, then rinse several times and lay flat to dry. If you absolutely must wash in a machine, put them in a mesh bag or the edges will fray terribly. Another idea would be to stay stitch all around the edge.