Are cargo planes generally old ?

Date:         29 Apr 99 22:10:01 
From:         "Frank Muenker" <frank@living-source.com>
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Hi,

I recently noticed on various trips that cargo planes seem to be generally
very old.
I've seen lots of 727, DC10-30, 747-100 and even DC-8/707, but hardly ever
any new aircrafts.
Shouldn't cargo airplanes have the same problems/calculations concerning
fuel consumption, maintenance costs, etc. ?
This observation might be wrong, but if not: is there any logical
explanation ?

Thanks
Frank Muenker