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Using rsync is surprising fast and simple.

mkdir empty_dir
rsync -a --delete empty_dir/    yourdirectory/

@sarath's answer mentioned another fast choice: Perl! Its benchmarks are faster than rsync -a --delete.

cd yourdirectory
perl -e 'for(<*>){((stat)[9]<(unlink))}'

Sources:

1. http://stackoverflow.com/questions/1795370/unix-fast-remove-directory-for-cleaning-up-daily-builds
2. http://www.slashroot.in/which-is-the-fastest-method-to-delete-files-in-linux