Come on, let's not make this too hard or waste time debating what's reasonable and what's not, it's just basic elementary maths:
Ages 18-20 - 3 seasons averaging 40g = 120
21-30 - 10 seasons averaging 55g = 550
31-35 - 5 seasons averaging 40g = 200
36-39 - 4 seasons averaging 30g = 120
120 + 550 + 200 + 120 = 990 goals and he can retire before turning 40. Or maybe play one last season just to hit 1000g. If someone is wondering about his slumping production in his 30s, it's only because that's when he really started focusing on his two-way play and won the Selkes. Goal scoring is a young man's game after all.
Don't understand what the fuss is about
The highly scientific model used above has proven to have an error margin of +/- 1 goals when calculating career totals in hindsight. To be fair, it's effectiveness in predicting the future has not yet been tested conclusively (small sample size) but the results analyzing past players are very promising, so there's no reason to believe it's very far off.