anchor.diff:        if (versions.isEmpty) continue;
   
         final PackageVersion latest = versions.first;
  +      if (age > 0 && now.difference(latest.created).inDays > age) {
  +        continue;
  +      }
  +
         final Pubspec pubspec = latest.pubspec;
   
         if (pubspec.sdkConstraint == null) {
  
positive.code:   final ArgParser parser = new ArgParser()
      ..addOption('output', help: 'The report output file (or stdout otherwise)')
      ..addOption('top',
          help: 'Select the top N popular package for notification');
    final ArgResults argv = parser.parse(args);
    final top = int.tryParse(argv['top'] as String ?? '0') ?? 0;
  
    int totalCount = 0;
    int noConstraint = 0;
  
negative.code:         allowsDart2Count++;
          if (!allowsDartDev && !allowsDart1) {
            onlyDart2Count++;
            onlyDart2Packages.add(p.name);
          }
        }
        if (selectForNotification && allowsDartDev && !allowsDart2) {
  