Experience won't always work for you. If experience was always valued then players like Luka Modrić and Toni Kroos would not be sitting on the bench at Real Madrid.
De Gea has been Manchester United's goalkeeper for a long time so we have no doubt that he is a manager with plenty of experience but it remains to be seen how well Bayern Munich will get from him.
In the last season for Manchester United, we saw that he did not perform as expected, that's why Manchester United was forced to end the relationship with him this season.
As Bayan Munich needs a quality goalkeeper, De Gea may be ahead in terms of experience but may fall short in terms of performance.
I don't think Bayern Munich is a team linked with De Gea, I mean Bayern munich has a goalkeeper they bought in last season's transfer window. So they will not waste money recruiting De Gea, especially since he is already old. I think Bayern Munich will maximize the performance of Daniel Peretz who they bought in last season transfer window. So, if Daneil Peretz is able to perform better this season, of course the gap or weak point in the goalkeeper position will have found the right person to cover this gap.
Bayern Munich has made many quite perfect adjustments in the last summer transfer window. so they will not be in a hurry to bring in players who are considered old like De Gea in the next transfer market. But apart from that, let's just look at Bayern Munich performance this season because if there are many weak gaps in their squad, I think the management will improve it when the winter transfer window opens.