code: function getAge (keyword, apps) {
      // FIXME this is a number in google play now
      const updated = R.pluck('updated', apps).map(getDaysSince);
      const avg = R.sum(updated) / apps.length;
      const max = 500;
      const score = calc.izScore(max, avg);
  
      return {
        avgDaysSinceUpdated: avg,
        score
      };
    }
docs: /*
  Score the average time since last update among the top apps.