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my $oldest;
my $oldtime = 0;
...
    ($oldest, $oldtime) = ($_, $thistime);
  } 
}

use List::Util 'reduce';
my $file = (reduce {$a->[0] < $b->[0] ? $a : $b}
                   map {[(stat)[10],$_]}
                   glob '*.pl'
           )->[1];

my $file = reduce {(stat $a)[10] < (stat $b)[10] ? $a : $b}
                  glob '*.pl';