Should I keep old sites?

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I just discovered that two sites I have, but have not been updating,
are still out there and are cached by google.  One has about 80 pages,
most of which are pr2 and some are pr 3.  The other has about 400
pages, most of which are pr3 and some are pr4.  

All of my newer sites are at pr2 or less.

The costs of keeping the older sites, both domain registration and
wweb hosts, are minimal.  So money is not the issue.

The real costs in keeping them up would be my time to update them and
bring them into the 21st century.

So should I keep them?  Would having them help in terms of getting my
other more current sites better ratings in Google?

I figure it will take me about 3 to 4 days per site to clean them up
some and add tons of links to my newer sites.  Plus I probably should
spend a little time getting the older sites new reciprocal links.

I would appreciate hearing everyone's thoughts on whether I should
keep them or not.

And if anyone thinks I should keep the older sites, what should I do
with them to have them help get my newer sites better ratings?

Best regards,


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