When I am trying to create G+ account it shows "This feature is not available for your account" , after that when I click on Learn more , it shows Age requirements on Google Accounts ....I think this due to I put less than 13 years in google account....now please suggest me how to fixed this problem.
You'll have to wait it out for that account/email address. (ie. wait 5 years before you can use Google+ on that account)
While I am trying to open it from gmail a/c it shows same "This feature is not available for your account" .
just go to plus.google.com and loginf from your gmail id, you will have activate your google plus account.
Ok, looks like Google just updated their age policy to 13 and over. Nonetheless, you will still have to wait it out. There isn't any other option, unless you want to delete that account and make another (ie. new email address). You cannot just change your date of birth whenever, hence why it's important to give correct information when signing up with these services. That DOB you place in is locked to the account for the general user.