Ella Beck! I think your English stiff upper lip is showing here.
First, this video was posted in another thread that I first replied to with others.
It's dated, and I know dated because I haven't dated for a long time.
You said it best when you said "unbelievable". I studied it and said it was rehearsed.
You saying "once you get beyond the age of seven, not much can be done",
is why I said that about having a stiff upper lip.
I learned to sing with harmony when I was in the youth choir, becoming the lead soprano.
Now, when I was in my late twenties, playing in show-bands in Toronto,
I would sit with keyboard players with synthesizers to play notes and chords,
to guess the note and see if I could tell if the synth sounds were major or minor.
That was something quiet to do onstage during the day,
but if you were using that equipment, and my amp was half-synthesized,
you had to do that so you could cope with those instruments onstage.
It's not note relevant,
but I used to practice looking away and reaching for the third, fifth, eighth, tenth and twelfth fret,
so in the dark, or getting into it with the audience or on the dance floor,
I could play without looking. I could hear people shouting he's not looking while he's dancing,
things like that.
With my self-made left-handed guitar, I'm not only getting half and quarter tones,
I'm getting descending and ascending cascading notes and chords, any time I want to.
And with my custom amplifier, my guitar can also make those sounds all by itself.
If this kind of video from India is new for you, and I'm sure he'd call you Sahib,
you'll be very surprised to see four year old children from China doing far better.