It’s not unusual to see folk trudging home in skiboots as the lifts are OPENING in the morning in St Anton. Yeah I guess you could call that “fun nightlife”.
St Anton is maybe a bit poor for less able skiers. If they’re only up to blues then they might be a bit limited for choice. Quite a bit of the easy stuff if basically just pisted doubletrack. More capable skiers will love it though.
There’s a saying about the resorts in that area that goes something like “You take your wife to Lech, your mistress to Zürs and your skis to St Anton”
Mayrhofen might fit the needs of a mixed ability group better. Its still got plenty of nightlife.
Ischgl is about as good as it gets IMHO though, for striking a good balance to suit everybody.
Kitzbuhel should be on your shortlist too.
St Johann in Tirol is not bad either but maybe a bit quieter at night… depends just how ‘ardcore you want your nightlife.