One of the youngest populations in Northern Europe due to its large student sector, Aarhus, you'll be happy to know, has excellent nightlife to match. Although still a step behind Copenhagen when it comes to variety and mass, there are enough small cafes, dance clubs, hole-in-the-wall bars, and live music venues that have a consistent clientele that you'll not be bored between Thursday and Saturday night.
The street most notable for nightlife is Åboulevarden, which follows the Arhus A (the city's main river) through the center of the city. There are plenty of cafes in the buildings here interspersed with some very good lounges and clubs. You'll have loud dance clubs like Römer, cocktail specialists like Herr Bartels, and packed sports bars (even when there isn't soccer on) like the Bridgewater. There are two drawbacks about the area, though. It's a bit pricey (drinks, entrance, coat-check), even by European standards, and many places will impose strict age limitations on the weekends, usually at a minimum of 23.
If you want a mixture of city's culture and nightlife, head to Store Torv, where you'll find the Aarhus Cathedral, as well as the oldest bar in the city, Thorups Kaelder. Then again, because of the city's manageable size, you can walk to other popular streets like Frederiksgade or Klostergade, where you'll find English-speaking bars like Sherlock Holmes, student hot spot Social Club, and a bunch of other smaller establishments where you'll probably find cheaper drinks. The best live venue in the city, Train, and probably the coolest student hangout, Ris Ras Filliongongong, are also within half a dozen blocks of each of the previously mentioned streets, making it quite easy to move between establishments.
For a compact and popular nightlife scene, Aarhus is a great choice. For further information, take a look at our listings.