If your site is 6 months old then go ahead. There will be no problem with it. Further, do not worry if your website gets rejected by the Google Adsense.You can re-apply for the permission.
Google Adsense reject the approval with reason. Resolve that reasons and re-apply again. Your website will get approved.
Note: Please remove the other ads that are appearing on your website. Of course, once you get the approval, you can use the other ad network. But till approval please remove the ads from other ad networks.