When are you an experienced player?

Anything over 30 is a decent level as far as I am concerned.

For a while I looked at lvl40's as possibly not that knowledgable. Let me explain.
The fastest way to get xp is to catch and evolve. So to get to lvl40 early on a lot of players did nothing more than throw balls and press evolve a lot.
They wouldn't concentrate on movesets and would not spend much time battling gyms.

Battling gyms is the slowest XP in the game. To spend your game time battling means that you are missing out on 'grind time' - and so it costs XP.
However, these players were concentrating on movesets and which mons to use. They were understanding gym mechanics and the intricate details of the mons they were using. Which to me shows a more in depth knowledge of all aspects of the game.

Of course, as time goes on, more and more players are getting lvl40, and it is no longer an indicator that you spend game time only throwing balls - so it is not as valid anymore.

Players aim for level 30, so they can catch the strongest mons possible in the wild...to aid in getting attackers for gyms.

So in summary, lvl30 shows you have done a fair bit of grind, and taken the game seriously - but being lvl40 doesn't necessarily prove you know the game inside out.

At 33...you are far from a n00b - the levels get long and boring from here on out.

EDIT The only dumb question is the one that's never asked.

EDIT2 Caveat - Some players are in areas that make it very difficult to level, and so may not be able to get to lvl30 easily, due to the distirbution of spawns/stops.
Being less that lvl30 does not make you a n00b in my eyes, but being over lvl30 does mean that you have moved out of noob territory.

Noobs don't assess IVs, don't prestige efficiently and put 1500 CP Blissey into a low level gym. So I think it's about all knowledge.

Definitely agree its based on game knowledge, I know people above 30 who still don't understand rather large parts of the game like move sets, IVs, how to effectively prestige or what to place in a gym when etc.

The moment you think you're above anyone else and the moment you think you know almost anything there is to know is the moment you stepped into the spotlight of being a noob (well in my book, at least.)

Level 34 here, and proud to be one n00b with two b00bs since 7/21/16! ;o)ß
When I find out what it takes to graduate, I'll let you know...

i would argue that we are all playing a game and since no one is being paid to play we are all amateurs , keep in mind that level means nothing taking in mind the unfairness inherited in the game ( how many spawning points , nests , pokestops , gyms and if you are lucky enough to be in the dominant team in your area , if you spend money or not .
it is a given some people will be better than others , but i hate the concept of Noob

In my opinion level doesn't matter. A level 25 player may know more about the game mechanics and metagame than a level 38. Some people remain noob forever because they don't want to learn...

For me a noob is:
1. one that stays blocked in the knowledge available and highly valued 2 months ago (i.e. blindly following lvl 30 scenario for attackers).
So basically someone that does not keep up with community progress.
2. One that still needs to search for a type counter for non common types. I find myself in this category :) .
So basically someone that knows the current meta very well, but lack on other general knowledge.

I only consider a noob those who cheats...

Not really a dumb question.

In my opinion, the "most" experienced players in the game, are the people who didn't read 3rd-party websites such as this site, but know about the gym mechanics only by themselves, without downloading the game master file.

Though, all of us don't meet this tough criteria.

when you are almost ready to go play something else

I think just knowing your types is enough. As for meta and strategies, and to some extent IVs, these were the reasons I stopped playing XY, my first and only console Pokemon game. When creativity is worth less than drill and grind, that's when I lose interest and quit. To my knowledge, all games of Eastern origin are based on that mentality. I hope Go, when it's developed enough, will be for me like WoW after Lineage 2. That is, leveling up while just doing fun things and not being punished for losing.

Level has very little to do with it. I recently met a level-35-player, with a nice collection of 3000+ mons ... who had no idea how type matching affected a fight, how to see which type a given mon is, or that types even existed at all.

A. How much out of game research you have done.
B. How much time you have spent in gyms applying that knowledge.
C. Nothing else matters.