I started playing in the late 1990s, and I think everything before 2000 is the first generation. I say that because in the late 1990s no one ordered discs online -- we bought discs wherever we could find them and bought whatever discs were available. Also, learning proper technique was only possible if you were lucky enough to find people to play with who had proper technique -- and I wasn't that lucky. I spent about 8 years with the same crappy drive and putt, never getting any better.
Then came the second generation, thanks to the internet -- or, more specifically, Youtube in around 2005. Now you can buy online any disc available, and with Youtube anyone can learn how to putt like Feldberg or drive like Jenkins. And not only can you watch pros do their thing, you can also record yourself, upload it on to sites like this and have dozens of anonymous people critique your form. So I have to say it's the internet that defines this generation -- the second generation.
What will the third generation bring? Who knows. But it will be obvious when it hits.