In Spain in general, and in Seville in particular, people of all ages like to go out for a drink and party. The city is very lively at night, both during the week and on weekends. You'll have plenty of choices if you want to enjoy the nightlife in Seville.
If you adapt to the Spanish rhythm, you will certainly have the opportunity to have a late dinner, which lends itself well to a drink in a bar or to go dancing in a club.
And if you don't want to dance, you'll be hard pressed to find an excuse not to enjoy a flamenco show. Emotion guaranteed!