No one is too old to learn how to play the piano, obviously. But the question then becomes why someone would want to learn the piano, and what they hope to do with it: whether it's playing pieces that would impress their friends and family, or being able to accompany a choir or a jazz band or whatever, or being able to play live music at a fancy Italian restaurant from 5-7 pm two days a week, or being able to play pieces from the solo repertoire, or achieving a high level of artistry, or becoming a teacher, or just having something to do on Thursday nights after work. I imagine that for adult learners, the more ambitious goals should be considered out of reach, and I do say that as one.
I am trying to figure out why this comment makes me so furious. I don't suppose you meant any harm with it, but it was like an echo of the +1 zillion comments I have read before in about the same style. With the exception, maybe, of the phrase "achieving a high level of artistry", you don't even MENTION the reason a person like me, for example, study the piano. I think it looks so pathetic: Impress family and friends. Have something do do on Thursday nights after work. To me, it is like a slap in the face. Was that all???
I play the piano because I love to play the piano. I love the music I have chosen to practice (or else I wouldn't play it), and even if I easily can find recordings that are technically far, far better than what I can achieve at the moment, the actual work gives me more dimensions, a richer experience. There is no better way to come close to a musical piece than to play it yourself, using your own body to create it instead of just listening to someone else's interpretation, follow your own personal whimsies and ideas, make them melt together with what the composer probably intended, making something unique that is YOU in symbiosis with this music.
It is also a constant challenge, I always struggle to push my own personal limits. It is difficult, I have to think a lot, plan a lot, repeat insanely lot, I constantly seek for new methods and ideas on how to learn and to practice, I have to go into the tiniest details as well as sometimes stepping back and try to grasp the whole perspective from different angles. It is a dynamic, evolving, fascinating process, a story about learning, about my brain, about life as it should be - if you ask me. It is like working with a sculpture that will never be finished, but where the grades of refinement never stops either.
Now, who thinks I care about the opinion of others? It is MY sculpture, my life.
The piano studies also gives me better insights and understand as a listener, of course. The more I learn about piano playing, the more I appreciate a great performance. Often I sit with my eye fixed at the pianist's hands. If I know the piece well, which you do if you have studied it and read the notes, my arms sometimes twitch a bit. I catch myself making faces, smiling, nodding, feeling the pain, the vibrations. And I also admire the enormous work I know is behind this master performance. If there are mistakes, I recognize that too. I don't get mad or annoyed, because I know that mistakes are a natural part of every performance.
As LvB expressed it - playing a wrong note is insignificant. Playing without passion is unforgivable. I THINK I understand what he meant.
So that is what piano playing is for me: PASSION. Pure passion. It breaks my heart that you didn't even mention that little detail. Instead you gave the usual list that looks so dull, so diminishing, so lifeless. Learning some pieces from the solo repertoire, sigh. Well, maybe you can express it like that, but to me it sounds like a big shrug.
Play because you cannot come up with something better to do with your spare time. Play because you have some unrealistic dreams about becoming the next shining global star, or because you need a job, or because you want to impress someone. Or - this sickness I see far too often among young students - because you are helplessly competitive and think life is about getting approval, grades, points, and to beat Him or Her or Them. To get a diploma that soon will be yet another piece of dust-collecting paper in your home, meaning absolutely nothing but to remind you that you had about 10 minutes of local fame somewhere, sometime.
We live in a difficult time where it is no longer enough to compare yourself with the kid next door, but with the whole world, with every living or dead Master you can come up to, and no matter how hard you try, you will always be mocked because someone knows someone who is better than you. How depressing if you are raised in this spirit of competitiveness!
And if you, like me, simply do this because it is your own private joy and passion, you will meet endlessly many people who simply have NO IDEA WHAT YOU ARE TALKING ABOUT, and they will comment this passion of yours, your piano playing, with "what's the point, you know you will never be that good. First of all, you are too old ..." and give you the standard lecture about brain plasticity which says quite a lot about their brains but nothing about yours.
Yeah, what's the point? If you don't know about passion, I can clearly see why the whole project seems pointless, "because you will never become a concert pianist". Sob. I would say that SOME people have a very limited definition of what "success" means!!!
You say that the more ambitious goals should be considered as out of your reach, if you are an adult learner. So only outer approval goals and money-making goals are to be considered as "more ambitious", or what?