Возраст в версии 2.x

 public function filterDateYounger($field, $value, $interval='DAY'){
        if (!strstr($field, '.')){ $field = 'i.' . $field; }
        $value = $this->db->escape($value);
        $value = intval($value)+1;
        $interval = $this->db->escape($interval);
        $this->filter("$field >= DATE_SUB(NOW(), INTERVAL {$value} {$interval})");
        return $this;
    }

if (!empty($value['to'])){
    $model->filterTimestampYounger($this->name, $value['to'], $this->getOption('range'));
}

public function filterTimestampYounger($field, $value, $interval='DAY'){
    if (strpos($field, '.') === false){ $field = 'i.' . $field; }
    $value = intval($value);
    $interval = $this->db->escape($interval);
    $this->filter("TIMESTAMPDIFF({$interval}, {$field}, CURDATE()) <= {$value}");
    return $this;
}