Just go on and enjoy yourself. Let the road carry you wherever you like.
What you need to do is to get rid of all these "too old", "futility" yada yada yada BS. You also need to be patient - take one thing at a time, don't rush, but don't hold yourself back either. Of course you will be able to play the Italian Concerto in time. You just have to walk the walk. The main trick, you know, is to know this: you WILL be able to play it. If you cannot play it yet, it is because you have more to learn first. So, learn. Have fun. Trust in yourself. It is a myth that you "cannot" learn because you have reached a certain age, that is rubbish.
I started to play again at the age of 46, I am 50 now. Indeed I played more than one year in my youth, but I had to begin from the beginning again and it took me a year to get back to my former skill. Today I play way beyond that skill, so obviously I can still learn and develop despite my so called high age.
One thing that has helped me a lot is to socialize with and take lessons from the piano "elite". Go to master classes, listen to lectures, read literature, take courses when you can, just don't be afraid. You are a part of the same community as they are, you play on the same instrument as they do, and in fact your practice routines should be just about the same as theirs. What differs are the technical level of the pieces you work with, but so what? They have been beginners too. They are just further down the road.
And NEVER, ever diminish yourself, thinking you don't "belong there" because you are not good enough. Just get going!