[nickd2001]

Agreed, there are indeed managers for whom sadly its about control and compliance. However, there are also nice managers who just might feel mildly insecure having a more experienced person as a subordinate. Perhaps the onus is on the older dev to be sensitive to that and find a way to make the manager feel comfortable with sometimes being "managed up"? To know that the experienced person is a helpful ally not someone who'd undermine them. It may be something to be direct about in interviews. Obviously the interviewer is prohibited from raising the subject due to discrimination laws, but there's nothing to stop an applicant saying that they really don't mind having a boss that's a lot younger, and that they just aim to be of help.