This is not true. Filebench does not take creation time into account. What most probably happens is that after the first run your caches (page/buffer caches) are warm (i.e. all the files are already in the RAM), so Filebench runs much faster. On Linux you need to run sync and echo 3 > /proc/sys/vm/drop_caches to drop the caches. In this case you won't see performance differences.
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