It's not because "he aged better", it's because he went through the whole "
Dead Puck Era". After his 4th season, only once the scoring in the NHL was over 3 goals per game, until he retired. Kurri was 34 y/o the first time he played in a season where scoring was under 3 goals per game...
Yes Kurri was always going to be behind guys like Gretzky and Messier but his stats got boosted because he had the chance to play on a dynasty and the most prolific era in history. Selanne had to compete with a lot of all-time greats during his career (Lemieux, Jagr, Forsberg, Kariya, Sakic, Lindros, Gretzky, Yzerman, Francis, Sundin, Palffy*, Fedorov, Modano, etc, etc). He played with great players too but was never really on stacked teams until his late 30's (mainly Zhamnov and Tkachuk in Winnipeg; Kariya in Anaheim; Nolan and Damphousse in San Jose; Getzlaf, Perry, Ryan, etc in Anaheim the second time)
Finally, Selanne didn't have to play defense much because he was a monster in possession. Kurri probably was too since he played with the Oilers but Selanne even had Selke votes in his late 30's. I don't think he was known as a 1-way offensive threat. Kurri was -69 once he left Edmonton (not saying +/- means everything but there's no advanced stats for that era)
The more I dig into this, the more I realize that it's not even close... I mean, it's ok if you have this particular opinion but a poll between these 2 players wouldn't be close. I understand if you say "
their peak and prime are close" but
if Selanne could post 100+ pts season during the dead puck era, imagine what he could have done during Kurri's prime if he was playing on Gretzky's wing
*
Palffy is one of the most underrated players of all time, he was over PPG during the dead puck era
Edit : look at that insane resume. I didn't even know but looks like he is the Olympics leading scorer of all-time
Eliteprospects.com hockey player profile of Teemu Selänne, 1970-07-03 Helsinki, FIN Finland. Most recently in the NHL with Anaheim Ducks. Complete player biography and stats.
www.eliteprospects.com