Lewandowski, Messi or Ronaldo's fitness is still excellent. And I wouldn't be surprised if they play until 38/39. I agree with you that Lewandowski can easily play until 38. But I don't think he will be effective at 38 for Serie A or Premier League. If Lewandowski can maintain his fitness, he can stay with Barcelona for a long time. Barcelona are going back to their old tiki taka tactics. And so I think if Lewandowski's fitness is good, he can stay with Barcelona until he is 38 and continue his good performances.
Capello said that in Qatar we saw the final death of tiki taka. I am inclined to trust him, because I came to the conclusion that even in it golden years, this strategy was nonsense and gave results only due to the highest skill of the performers. I don't think that Xavi will last long in Barcelona and that tiki taka will be relevant there (although it would be good since I'm a Real Madrid supporter). But in general, this will not prevent Lewandowski from playing until the age of 38-39 - La Liga is not as intense as the Premier League.
Spanish side didn't play much of tiki taka but most of the tactics did go well as planned for them
That doesn't mean on should go ahead to say that tiki taka is dead yes I know that football has grown to another level still
Lewandoski will play longer than we even imagine winning la liga can still be achieved the club and players look promising for the future
With the performance that Lewandowski has shown since he first joined Barcelona, there is hope that he can last longer with this club. He answered a need that Barcelona had not had in recent times, he also managed to adapt very quickly and it didn't take long for him to score goal after goal. Even now he leads the top scorer standings in La Liga. That suggests that he really was going to be playing for Barcelona for a long time until his age completely stopped him. From his 14 appearances for Barcelona he has scored 13 goals and that was in his first season. Satisfying statistics for a striker who has just experienced a new atmosphere in La Liga.