If it is true that Lewandoski is going to Barcelona, then it will add to the lineup of players over 30 years old to be more. That would add to the list of old players. But if Barcelona were to make a cheaper price it would be advantageous with their current financial circumstances. Auba came also entering old age. But for another 2 years it seems like it's still quite effective. Barcelona could use that to improve their financial situation. But I heard that Gavi will leave because there is no agreement with the management yet.
Having Aubameyang and Lewandowski both is going to be luxury for Barcelona.
Even one of them is unable to play from time to time, the other one can make up for his absence by being very effective in scoring. Aubameyang has already proven what he can do with Barcelona. I would expect the same from Lewandowski and he should be able to perform even much better than him. Both of them are aging but they can both still perform very nicely for a few years. 
