This is going to be a loaded topic so please bear with me.
Thoughout the years, I have been getting compliments and criticisms from non-musicians and musicians alike. I have been getting lots of comments in real life such as "wow, you're like Beethoven junior!", "You totally rocked those ivories!", "ZOMG piano master!", "(Insert compliment here)" I actually like these compliments

though I'm always asking myself, how can I be better than what I am? Did I hit a plateau or could I still keep going? How much potential do I have beyond my current level? etc.
Of course, comparing myself to non-musicians and the average Joe (not trying to brag), of course I would run circles on them in terms of piano playing. Now compared to other musicians that are taking lessons as well, I consider myself to be on par or sometimes just slightly better/worse, but of course comparing to virtuosi and the greats, I am pretty bad and no where near their level of technique/interpretation/musicality.
A little brief background about me. I started piano at the age of 8, took formal lessons under an ordinary piano teacher (not those that specialize in competitions or virtuosic playing). She is a very good teacher and very beginner friendly. At age 12, I started to compete (sadly I never won, but made it to the state level for the scholarship competitions, NFMC a.k.a. National Federation of Music Clubs), and then around age 15, I auditioned and made it to a music conservatory where I began studying under a world class pianist. After graduating high school, I went and studied computer science due to the job market (though I would have loved to continue to study music!), so then whenever I have time I tried to retain as much of my technique and musicality as much as I can. (Just fyi, it has been at least 6 years since I've had formal lessons under a teacher; yes I know I should invest in lessons and find a good teacher, but money is tight here so that's not an option right now.)
My definition of a "virtuoso" is one that is able to achieve very high technical mastery while also having a very complex interpretation of the music and then being able to deliver the music with deep feelings, set the mood in the hall, very colorful, etc. Some of these works include but are not limited to: Chopin Etudes, Rachmaninoff's Concertos, works of Liszt, etc.
Finally, I have read somewhere that from a psychological and physiological standpoint, it is very hard (if not nearly impossible) to reach virtuosic levels for most people depending on their music backgrounds. In my case, I'd consider myself to reach pretty high, but unlikely to be virtuosic due to the fact that I started at a late age, my background isn't as rigorous as some of those greats (started at 8, and never really gotten very proficient until 15 whereas the greats have already done major performances won major competitions had training with other greats and access to better pianos at an earlier age.).
From the psychological standpoint, while it is true that at the age of 23, one is more mature than an 8 year old or even 3-4 for the matter, but also by then, something in the brain called "neurons" (which are special brain cells that help with learning, motor skills, stuff like that..) start to peak and then die off as one ages. I've also read one's prime is around the age of 25, where the amount of neurons are still sufficient and that one has fully matured in terms of the brain as well as character. (Even though kids have more neurons than adults, thus resulting in faster learning, they lack the maturity that adults do as well as the life experiences.)
Now from a physiological standpoint, those that start early have the advantage of playing well due body still growing and has time to adjust to the changes that are necessary to (physically) perform well. This includes hand size, arms, fingers, etc.
Well of course there are exceptions and the "greats" that I'm referring to are those that managed to retain their technique, interpretation, and understand of music due to their foundation and
most likely a (physically) healthy body as well. (before too many neurons have died off)
Now with all of this in consideration, what do you think of the possibility of achieving a level of playing that is on par with virtuosic pianists?
What is your definition of a virtuosic pianist or virtuoso? How do you define it?