This isn't about your hair being gray.
(Amerikans say gray not grey)
Look, I escaped the borg many years ago.
I have gray haired friends wanting to leave.
I am sometimes on calls w IBM and recognize people I haven't seen in 15 years so they are still there.
The issue is this... they want to pivot and they want employees who can pivot as needed. Unless you're on the leading edge (IBM doesn't do bleeding edge when it comes to customers), you are SoL.
IBM isn't the thought leader when it comes to technology.
They need to fire the bean counters and become a lean, agile start up. But that type of culture change will kill the company.