I was 10 years old and if you weren't around, I can tell you the Beatles arrival changed the music universe profoundly and forever. Their music clearly exceeded the sum of the parts and literally changed and grew with each succeeding album.
I played guitar when I was young, and then a little piano, and find it hard to believe anyone who was of age at that time and who appreciates music, doesn't recognize the seismic shift they created. I also enjoy dozens and dozens of other bands (as well as solo artists) that are too long to list here, but the Beatles started it all.
And I believe the Lennon and McCartney songwriting team will someday be considered among the best in history.