For comparison's sake. Mike conley has played about 60 more games than Gasol. Another comparison: Tim Duncan was at the top of his game till he was at least 33. At 33, he had played 977 games or roughly 326 games by the end of the this season more than Gasol has played which is 631 as of today. Duncan ended up playing 1392 games, or double gasol.
Shaq was similar, he played 941 games: age 33, before he started to wear down.
Taken into account 82 game season: gasol has at least 4 more years of high level of play, given the fact that Gasol has taken very good care of his body.
What people fail to realize is that Gasol started really late. He was 23 years old when he played his first season in the nba. Also, you have to facor in that the spurs played more playoff games during tim duncans years so I could see gasol playing well into 36 years old at a high level.