I never started playing tournament chess until I was well into my 30's and became obsessed with it for several years. From 1987 to 1993 I managed to reach 1450 USCF and pretty much called quits after that so far as competitive chess was concerned. I put many hours into study and practice but I realized after awhile that my ship had sailed as far as reaching any higher ranks.
I know a kid in high school who has been playing less than 2 years who is already strong Class A and is close to making expert. Why? I don't know. All I know is some people have a knack for chess in ways others don't.
Some say you can go as high as you want with time and study. I think of the many International Masters who have put in literally hundreds of hours dedicating themselves to chess but just can't get that final norm for the GM title. That filters down to all the lower ranks also. With time and study anyone can improve but there is an unknown ceiling for everyone. Only a deluded individual thinks he can play at Magnus Carlsen's level with only dedication. I'm thankful we aren't all the same because if we were then no one would stand out in anything.
Is it me or do you stumble across these naive players who are like, "I've been playing for like one odd year and I'm 2000+".
There seems to be this form of, let's say, "short-cut" to the top. Let me tell you, this is an insult to the game itself. It takes years of practice and perspiration to become an expert in anything.