Reddit mentions of Accelerated Piano Adventures for the Older Beginner: Lesson Book 1

I would learn some basics online or through private lessons. For classical music, there are some technique barriers that will make a piece super easy once you know some general rules. For pop or other songs, technique will make it really easy.
I personally like the Faber book series and there is one made for older beginners. I've never used this particular book, but I have used his original series for younger students, which I think is fantastic.

https://www.amazon.com/Accelerated-Piano-Adventures-Older-Beginner/dp/1616772050/ref=sr_1_3?ie=UTF8&qid=1518715871&sr=8-3&keywords=faber+and+faber+piano+book+1

If you're interested, you can PM me and I can help set you up through Skype. I can do all the basic stuff like proper posture/hand position stuff to get you started.

I did a few beginner adult classes at Yamaha Music School in April, there are 2 of them in the city, one in the North another in the South

I went in for 11 lessons, 45min duration each, $45 per lesson. So $1 a minute.

The instructors you get to choose, based on your time preferences. You'll have to get your own lesson books and the instructor teaches out of your book. You go there to the facility every week and play the piano they have there inside a room. It was quite different playing on an upright piano as opposed to my digital piano at home which took some adjustments.

I got this book and the instructor pretty much went page by page, it was worth it in that it was motivating for me to learn. I got assigned homework songs to practice and the instructor critiques me on them the following week.

https://www.amazon.ca/gp/product/1616772050/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

A lot of the stuff were pretty basic, especially the music theory part, I recommend doing youtube videos to cover the basics of music theory if you don't know it (so that you don't waste time going over it in the lessons since time is money...), and this site is amazing for testing yourself as well as learning music theory https://www.musictheory.net/

If budget is tight for you (it was for me), just go in for a few lessons to get the basic techniques down, and then you can teach yourself out of the books until further down the road when you get more advanced.

There are also other books to choose from, namely Bastien and Alfred series of books. They all have a whole progression by different levels and you can work your way thru all of them by yourself if you are motivated.