5 days in tokyo

I have 5 days in tokyo; our first time; what do you recommend as must sees ; we are a couple in our 50's;

There is no "must-see" place (really none), especially in Tokyo. It all depends on your interests.

If anything is fine for you, there is an endless supply of generic lists on the internet. One I would recommend in particular is this official guide https://www.gotokyo.org/book/en/list/1116/
Pick up a paper version once you arrive in Tokyo.

I recommend these places for first timer
1. Shibuya, Harajuku, Meiji Shrine
2. Sensoji, Sky Tree

The rest depends on your interest and where you're from
1. Odaiba - Game/Anime
2. Yokohama - Night View
3. Ginza - Brand Name
4. Akihabara - Game/Anime/Idol
5. Disneyland/Disney Sea
6. Tokyo Station - Architecture
7. Imperial Palace - Culture
8, Tsukiji - Sushi/Sashimi

I sometimes get ideas from the following site:
https://www.timeout.com/tokyo

But really, the possibilities are endless. There are many good online sites that can provide you with ideas. I would encourage you to pick a limited number of places that really appeal to you, and then plan your transit strategically. Getting around Tokyo can be time-consuming, and for the most part it is not all that much fun. (As an exception, I think the Yurikamome line ride across the Rainbow Bridge is actually func But Odaiba, where you end up, for me isnft a gmust.h) Anyway, you donft want to spend any more time on trains and subways than you have to.

A lot of places in Tokyo are not just one specific site, but general areas where you might easily spend several hours just poking around. Among other things, Ginza is way more than just a gbrand-nameh shopping spot these days. There are some really good, more-practical stores such as the newish Muji flagship store, a huge Loft, and even a new large supermarket. And the Itoya stationery store has always been good. Also, the Ginza Six complex has a nice rooftop garden terrace that is a good place to relax, eat purchased food, and enjoy some interesting views. Even if you arenft particularly interested in shopping, I think Ginza is a good destination for strolling, and itfs easy to get to, so itfs one place you can cover fairly quickly if you want to. I like present-day Ginza a lot more than the Ginza of 25 years ago. Itfs still iconic, but seems to have gotten more down to earth. (But also more crowded with foreign tourists.)

You don't give much info, like your interests or when you'd be traveling. But there is something in Tokyo for virtually everyone. Hundreds of museums, many places for shopping, over a dozen traditional gardens, several great places for city views, you name it.
For a first timer, the Sensoji Temple is just about carved in stone for everyone. If you go from late winter to early May, you can also see the Denboin Garden there, which is closed to the public the rest of the year. Meiji Shrine is also very popular among new visitors; the shrine is fine though not Japan's best, but the shrine garden is quite good and mostly ignored by the mobs of tourists streaming past it. In fact, it's hard to believe you're in one the world's biggest cities when you're in it.
Another important detail is if you are also going elsewhere while in Japan, such as to the Kansai Region, or your time in Tokyo is your whole stay. If the latter, for a more well rounded experience, after about 3-4 days in Tokyo you could get out of the city for a day trip - there are dozens of choices, like Nikko, Kamakura, Karuizawa, Chichibu, Hakone, the Fuji 5 Lakes, etc.
You can do yourself a big favor and figure out what appeals to you the most, and then going to the best places for it. If you just wander around cluelessly, you might, if lucky, squeeze out enough novelty to think you had a great trip - but in reality you will have missed a ton of great places.
You can start by looking at the resources below:
https://www.japan-guide.com/e/e2164.html
https://goo.gl/qyQtGV
http://www.gotokyo.org/en/