Does age matter for any song? I'm a middle school student, and my aunt is somewhat provoked that I even attempt songs like the mov.3. You thought "the messenger" was scary, wait till I show you a picture of my grandma with a skirt! (shivers)
Music maturity (and maturity in itself for that matters) isn't determined by age
There are 9 years old pianists that not only play virtuoso pieces but play them with control, elegance, beautiful dynamic and are worth listening indeed
The problem of overplaying emotions is one often leading to injuries and tendonitis
The majority of pianists who get injuried and end up working with retraining teachers are those that sacrificed the tensioless playing in favours of artificially created (through tension) emotional playing
This doesn't mean that an emotional piece can't be very load and resonating but that it's possible to play fff and the technically hardest pieces and emotional strongest pieces without any tension at all.
That's because producing a strong emotional sound is a matter of "gravity"
You don't play the piano by pushing the keys or pulling the keys down but by the falling weight of your hand on the keyboard. Strong and emotional sounds must be produced with the same kind of easeness and relaxation because it's gravity that allows you to make strong and no matter what the muscular contraction lasts less than 1 millisecond anyway. There are pianists that just "act" a lot while playing and they just are using their whole interpretating the music in a way . There are other pianists that move a lot and almost cling the teeth and tense the muscles when they're playing strong, load and emotional pieces. In this case, this kind of attitude just hides a very lack of foundation on how to play the piano or better yet how to take advantage of our physiology to play the piano effortlessly
For ideas on how to achieve this let me direct you to other posts I've written
https://www.pianostreet.com/smf/index.php/topic,22781.msg259177.html#msg259177https://www.pianostreet.com/smf/index.php/topic,22993.msg255843.html#msg255843https://www.pianostreet.com/smf/index.php/topic,23045.msg256169.html#msg256169Begin by making sure you're at the correct distance and height from the piano
You should for patterns of jutting elbows, unnaturally curled fingers, low wrist and raised shoulders. These are often your body way to maintain a balance necessary for playing. When you find the correct height it's must easier to mantain a proper arm-wrist-hand alignment and playing without tension (hence producing load emotional sound with must more control, accuracy and no tension at all)
Topic: Help on moonlight sonata. (Any music period)