Most of the parents thinks that for joining a social network site like "Facebook" or "Google +" 17 or 18 is not enough. But as per the Google it is now 13 years old. So actually Google Plus " reduced the age limit to 13 from 18.
Google had made a lot of improvement in its security and privacy features. Now even the small one's can join the Google plus and do much more. The top most competitor of "Google +" is the Facebook. The Facebook also reduced to 13. This is also another reason for the Google to move to 13 and now the Google is also expecting new small members to join there network.
Recently Facebook was facing some security issues in there site. and most of them are resolved but as per the Google they offer much more security and privacy.
As per the Google officials they said with "Google +" each and every small one's can maintain a healthy and friendly relationship with anyone across the globe.
This is a golden opportunity for youngsters those who does not have a "Google +" account. Google has also removed the terms & conditions in creating the Google + Profile names, now the users can use any kind of profile names they wish.
Source : Google +