I think for at least two more seasons he will perform at his current level, and then you can think about ending his career. Especially when you come to a club like this you just have to show a good game and I am sure Robert understands that and will do everything to keep the bar high. Also, he may not be going to Barcelona
Yes you are right, at the moment he can still show his best game for at least two more seasons. Of course, this time of maturity will be used to help them win a title that has been difficult for them for several seasons. Of course the coach will not arbitrarily recruit players if the player is judged to be unable to contribute.
One of the reasons Bayern Munich set a high price is because Lewandowski can still show his best game even though he is 33 years old. Bayern Munich still wants to keep Lewandowski even though they have brought in Sadio Mane from Liverpool. Until now, the Lewandowski transfer process has only been a rumor, there has been no agreement between the two parties because the offer submitted by Barcelona has always been rejected by Bayern Munich. If Barcelona wants Lewandowski in their squad, the only way is to meet the price set by Bayern Munich or wait until his contract expires with Bayern.