When do you consider yourself not an nfl noob?

Example, I only started watching the nfl in 2016 when I was 21? (Am 29 now), and picked the Vikings because of HIMYM (curse you Marshall, this team has driven me mentally unstable)

I've played fantasy and madden ever since and usually follow the news, what's going on etc. But, I feel like I'm lacking more a less on older rules, older players, etc. Besides the big names and my own team, if you asked me if I knew who x player from x year was from your team I probably couldn't tell you. Then you see videos of guys who just name them on a whim and it blows my mind to have that knowledge.

I guess I could always learn more, and that's why I'm subbed to this place because you always seem to learn something new everyday.