I'm a decade older than peers, and have people in my chain of command who are a few years past half my age.
I end up being the one explaining cloud technology and what other companies are doing with their tools. I spend a lot of time staying current with best practices in industry, but I'm also old enough to know that yesteryear's Object Oriented Design is yesterday's Six Sigma is today's Agile—none of it replaces understanding complex relationships and processes that are proving very expensive to migrate. There's a reason COBOL is still around (though I'm not aware of any instances inside the company).
That said, my biggest fear is ageism in going after a new job. Thanks @OP+1n0hVWgZ for confirming to the general audience here that ageism a real and continuing issue. From my point of view, it's not age but settling in. A fortysomething whose only job has been AT&T probably has more ossified opinions than a sixty-something who worked in other companies and industries. Exhibits A and B: Randall Stephenson and John Stankey.