50th Wedding Anniversary in Paris

Price?

La Tour De Argent is pricey and worth it.

Or

Le Pant Rouche

Or

Les Coupe-Chou

Or

Cote Cour

Having spent 3 weeks touristing in Paris, my best advice is don't go. Go to Prague. U Bila Krava, a cute little French restaurant in Prague, will satisfy for a romantic setting.

But if you must co to Paris, there are very fine, very fancy very expensive restaurants galore, but is a $400 dinner Romantic, even with candlelight?

Check TripAdvisor where I think you can search restaurants by "romantic"

Otherwise, I think your best bet is a classic Bistro, which is where real, not filthy rich, Parisians dine out, such as www.l-europeen.com/en/ "You can be seated in dining rooms on several floors, guaranteeing a more private meal.
The place is warm and inviting - wooden swirls and mirrors, glass chandeliers, English Chesterfield style armchairs on casters and benches. The unique, old-style décor guarantees that you will spend a pleasant moment dining here."

JK, I don’t have any recommendations for a dinner locations at that level, but I just want to share a warm congratulations for your 50th anniversary, and I’m happy that you are going to such a beautiful city to celebrate! I hope you have a wonderful trip!

We had lunch here on our 43rd; it was wonderful: We reserved as early as possible (2 or 3 mos out) and got the best table in the house.
https://janettravels.wordpress.com/2016/03/01/anniversary-lunch-at-la-tour-dargent/

If budget is an issue, many of the best restaurants are much cheaper at lunch for similar amazing meals than at dinner. Classic bistros are fairly likely to be serving airplane food especially if they have enormous menus.

We have also had celebrations at L'Initial, Les Ombres and Bofinger -- all satisfying. Our current favorite is L'Initial; plain room but wonderful multi course dinner.

I'm focusing on the "romantic". We had a wonderful romantic dinner at Le Ciel de Paris on top of the Tour Montparnasse.
http://www.cieldeparis.com
The food was very good, the service was very good and the view was fantastic. You are looking out over Paris and if you are there at night, you get to see the Eiffel Tower light up on the hour.
We are not gourmet diners, but we are also not indifferent to the quality of what we are served. Someone else may find fault (people sometimes have their own exacting standards), but we found it to be very good. It is a little expensive, but not in my opinion too expensive for a 50th wedding anniversary in Paris.
Congratulations to you both, wherever you choose for your dinner.

Congrats on your 50th anniversary! We will celebrate our 49 in August. We met on a school trip in 1966 when she was 14 and I was 15. We'll be back in Paris mid May to meet our grandson who is finishing his first year in college that he spent in Paris.

While there, if you want to splurge a little, take a two hour tour of Paris at night in a vintage Citroen 2CV. We did this last time we were in Paris. We had a blast!

If romance and memories are the top priority, and budget not a problem, I think Jules Verne on the Eiffel Tower can't be beat. You get a dedicated private elevator, wonderful service, and a view you will never forget. https://www.restaurants-toureiffel.com/en/jules-verne-restaurant.html

Another memorable restaurant would be Train Bleu, in the Gare de Lyon. https://www.le-train-bleu.com/en/

Congratulations!