Well, have we met? We did play one event down there on the coast.These numbers sound about right to me. There are a couple young men here in Oregon who work hard and put in the time that have been playing around 5 years total. One is a 619 the other a 639 and both were in the 500s within 12-18 months of picking up a cue.
The ceiling is the thing. Starting in your 20s sadly is a bit late to ever be more than this without the natural talent few have. Neither one of these will ever likely be 700 players. Maybe not even 650.
That outline pretty much covers my Bio. Started similar and attained 620 to 630. Now at uh 74.625 my number is so low I don't look it up anymore.