Starting January 31st, you will no longer be able to add or edit your Google AdWords ads using the standard text ad format. It will only allow you to use the extended text ad format.

Google posted a reminder on Google+ saying the last day to add or edit your AdWords ads using the standard text ads format is on January 31, 2017. Google wrote:

Google began rolling out expanded text ads over six months ago. So most of you should be comfortable with the new format by now.

Forum discussion at Google+.