I want to learn to play the piano

Go ahead but do understand that learning to play the piano is difficult and will take a long time. Learning on line must be like tackling undergraduate maths when you failed GCE maths 35 years ago.

Of course you may be able to get a piano for free.
Perhaps look on freecycle.

It's never too late. I learned aged 40 but used a teacher. She loved teaching a keen adult and I loved her encouragement and praise. It also meant I learned to read music. Do as you wish but I'd also advise some lessons with a good teacher at first. Enjoy.

Witzend the Carol Barrett books looks good - thank you

I'm think I'd like a digital piano but may need to settle for a decent keybord. Planning to pop along to a local piano shop to seek guidance and gain an understanding of how far my funds will go.

May have some lessons with a teacher in the future but first want to go the book or online teaching route as that's what feels more comfortable. Any recommendations would be welcome.

Good luck

I don’t know about online, but there’s an excellent course for adult beginners (classical piano) by Carol Barratt, books 1-3, available separately. It really does start from scratch and doesn’t assume any prior knowledge. You may be able to find 2nd hand copies online.

First of all do you have a piano or a keyboard?
You could look for a teach yourself piano book on line or look at you .
tube.
It's a great thing to start to do.
But best way is to find a teacher even for a few lessons.
Best of luck.