Don't rely on it. He is already 35. I will be surprised if he still plays in Europe next season. I think he is in decline and it began in Bayern (it was not for nothing that Bayern did not want to sign a long-term contract with him and only offered him a year), but we did not notice this because Bayern itself was fine.
It could be the reason why barcelona signed felix as lewa's age may become the main concern soon. Lewa's performance is also dropping a lot compared with las season. Take felix as a trial was the one of solution owned by barcelona as a preparation once lewa will leave from club but consider lewa's contract will be last till 25/26 season and i think that barcelona can still rely on it till the end of his contract.
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It is unlikely that Lewandowski will play in Barcelona until the end of his contract - he will not have enough strength to be at the same level until he is 37-38 years old. Even Ronaldo is suffering greatly from age despite of he is a football and fitness fanatic. I think the ideal option is to sell him next summer to Saudi Arabia - Barcelona will be able to improve their financial affairs, and Lewandowski will still have the strength to shine in Saudi Arabia.