ceslava

Have you tried to find out which one from your tags was created first? Or Which term for your custom taxonomy was last created?
Last one happens to me, I had so many terms on several custom taxonomies that I wanted to know which ones were last created. The problem is that there is no record of the publish date on the wp_terms table from the WP Database. But since IDs are auto-incremental we can use this field to order by date our terms.
So I added an extra sortable column with the ID term to your taxonomies (Tags, Catgeories or Custom Taxonomies).
By default Tags and Categories pages will have the extra column. If you want to add the extra ID / Date column to your custom taxonomies go to the plugin settings page at Settings -> IDATERMS.

IDATERMS

Add an extra column with the ID term to your taxonomies (Tags, Catgeories or Custom Taxonomies) so you can sort your terms by date.

There are times that you need to know the ID number of a page or post in WordPress and it can be more painful than it should be to find that number. This plugin does one simple thing: it displays the ID number of the page, post, category, or tag you are looking at in the WordPress Admin Bar. It appends this ID to the edit menu already on the Admin Bar. Needless to say, that means that this plugin is only useful for WordPress version 3.1 or above, since the Admin Bar was first introduced with 3.1.

Admin Bar ID Menu

Makes the ID number of the current page or post visible in the Admin Bar.

IDATERMS vs Admin Bar ID Menu