Are bars off topic? If not, we are looking for "nice" bars.....either classy bars with nice furnishings and chairs, or bars with nice patios. We are also looking for live music where we will not feel old and out of place. We like jazz and blues, but don't want to be the only grownups there.
The bars mentioned are good, traditional bars. Oak, Bouligny Tavern, Sylvain, Bellocq, Cure, and Bar Tonique are nice bars that are at the forefront of the craft cocktail scene. I recommend any of those, but Bouligny Tavern and Bellocq are my favorites. No music at either. Oak has music on the weekends sometimes.
Or you can just stroll down Frenchmen and check out the bars. That's a good time by itself.
Irvin Mayfield's Jazz Playhouse at the Royal Sonesta Hotel and the Jeremy Davenport Lounge at the Ritz Carlton have plush furnishings, great acts, and you won't feel like the only grown-ups.
The Carousel Bar has live music too, although the Carousel end of the room can get rather crowded and loud at times.
I think you'd enjoy happy hour at Three Muses on Frenchmen Street, which besides live music and well-prepared drinks also has some very tasty and creative small plates.
No music, but I think you'd still enjoy visiting the beautiful Sazerac Bar in the Roosevelt Hotel. I like it there best in the afternoons when it is quiet and you can fully enjoy the majestic art and design of the historic room.