Though I was into Martial Arts in the mid-80's I didnt formally start TKD til just after this period (91'), however I still consider where I started "old school", as my instructors started in the 70's.
I still employ much of what I did then.. now. I believe hard training develops good students, so when comparing then and now I compare with general TKD, rather than any one school.
Then toughness was simply part of the course, if you didnt have it you would gain it quickly or quit! For example, I recall in my early days when I was a yellow belt watching a fellow yellow belt sparring against a red belt.. there was no 'teaching type sparring', the red belt whacked the crap out of him, finally nailing him with a spinning back kick that took him 2 feet off the floor... and no one told the red belt that was out of order... as it wasnt back then.
I feel TKD's TKD is more friendly and respectful of the beginning students.. I teach my students to help them grow, not that they are cannon fodder, as personally I feel this is better.. back when I started, the blue belts hardly spoke to you and the red/black belts didnt at all!
That said, I think back then (in Ch'ang hon/ITF) a 5th degree was a rare sight.. now they are two a penny.. the high grades for the masses has made TKD loose that little something special
Life has also changed things a little, we use to do warm ups that involved a run to the park about 2 miles away, bare footed etc. People would watch in wonder as 30 students in white PJ's passed by.. now you get little twats making Bruce Lee noises.. oh well!
I think back then knowledge was less because less was questioned.. especially regarding patterns.. everyone 'just did'
As I said previously, sparring was tough, when you visited other clubs they would try to put you down (physically), even the instructors (I had this on numerous occassions).. now I hope people respect others in a more furfilling & productive way (though we always treated people respectfully at our club btw).
Also the arts rarely mixed.. kung-fu with kung fu, TKD with TKD etc. now everyone is much more open to training with others.
Thinking back, some things made me laugh, you use to get the odd tough guy join (a Kick Boxer or some other toughguy) who rated themselves.. they often went a bit OTT with juniors and now they would be pulled aside and told to calm down.. back then we as BB's) we simply told to teach them some humbleness.. for me that was speed and kicks very close to the head, for my training partner John it was more often simply knocking them about.
Another incident I remember was sparring against this 18 stone black tag, I had been a 1st dan a few months and I weighed 10.5 stone, I was pretty fast and flicked a controlled kick to his face which drew blood and he lost his temper (badly) and tried to beat the crap out of me.. lol.. I kept moving around thinking it will stop soon and wondering what to do, as to let him take me out looks bad and to KO him (my only option really considering his size) would look bad to my instructor.. I looked at my instructor during this to see what he'd say or to see if he call it to a halt or something and he just looked at me as if to say "well, lets see what your gonna do next".. in the end I took his leg out and then apologied for the previous kick that drew blood!
So, I would say the main difference between then and now is toughness.. it was tougher then for the average student than it is now.
Stuart