Well this happens to be a subject that I feel quite passionately about. Deep down I am persuaded that it is never too late for a person to achieve a masterful piano experience. In my experience the main barriers for people regarding progress are:
mentality
time/commitment
motivation
If an individual has the mentality of achievement, they will achieve. If an individual has the time and motivation to put forth energy toward a desired goal, they will claim it. I would also note that one's expectations and preconceptions about what exactly one wishes to achieve and what we actually achieve are perhaps always very different from each other (or if they are the same, we don't necessarily know it). In other words, there is really no way to know exactly what a person is actually achieving by reaching any particular goal, other than some form of movement in life. This is not an argument in favor of not setting goals, just a thought toward setting realistic ones.
By "realistic", I do not mean shallow and meaningless but quite the opposite. If making music is a goal, a concert pianist (btw, what does that really mean anyway, to be a concert pianist?) is not necessarily achieving any greater heights than is the five year old beginner with "Mary had a little lamb". Sure there are differences in the complexity of the music itself, but not for the individuals playing the music to match their levels. So for a 5 year old beginning learner, "Mary had a little Lamb" may be some version of complexity as is Rachmaninov's 2nd piano sonata for an "advanced" learner.
So what is the goal when one decides to study the piano long term? What are we really talking about when we speak of music as an occupation (he he)?
Furthermore, whether a person has an invitation for a concert career or not, there is nothing stopping a person from setting up their own performance engagements, and lostinidlewonder you have been an encourager in the past on this front. Also, there are amateur competitions that demand a high level of musicianship with open ends on the higher age caps. These types of things can be great events to aim for if it is motivating an idividual to learn about music (again, what is one really achieving?).
corueda, I think probably you would just like some encouragement. I would encourage you to do what you wish, set some specific goals and set out on a path with a knowledgeable teacher (if possible) to reach those goals and actually, you are already on it! Probably one of the main points is to enjoy the process and see what kinds of things you discover along the way. Ultimately I think it is all and only a path of discovery with glimmers of arrival points.
In the broadest sense, an idividual's goals will either pertain to committing to a lifetime's worth of study including repertoire that would require a good amount of preparation, or they do not. I do not think there is any form of in-between for anybody. And why would either of these types of goals be unrealistic for anybody at any age?
This is maybe helpful and maybe not (just ignore me if it is not

), either way it is only food for thought.
Here are some links to threads where topics similar or pertaining to this one have been discussed. You may find them inspriring and helpful in your endeavors.
Sincerely,
m1469
https://www.pianoforum.net/smf/index.php?PHPSESSID=7281824873422c2b3e470cc094ea95af&topic=2125.msg17864#msg17864(It does not matter what is the actual relationship between age and accomplishment. What matters is that the only correct philosophy is to believe that age does not matter at all. If you believe otherwise your own belief will be the source of your limitations. - Bernhrard)
https://www.pianoforum.net/smf/index.php/topic,2976.msg26082.html#msg26082(benefits of starting later)
https://pianoforum.net/smf/index.php/topic,143.msg35967.html#msg35967(comparison between adult beginner and a child)
https://www.pianoforum.net/smf/index.php/topic,3992.msg36199.html#msg36199(Do children really learn faster than adults?)