the value depends on the names...
age can make the make them more valuable but the most important, you know that of course, are the names
would you mind in posting them here?
Most of the major Search engines (especially Google) uses the domain age as a part of it's algorithm when calculating the search results.
(brand) new domains are more likely to be spam domains so "aged" domains can in many cases be considered more "serious" by SEs and less likely to be used for spam so they can rank higher...