Can't really say much more than that: you certainly can. There's a trick to "navigating ageism": simply refuse to be a victim. You're only a victim of ageism if you give yourself the permission to be one.
I'm hitting 50 pretty soon. I'm old enough to fully acknowledge that I have no idea what would happen tomorrow, but I have a fairly high level of confidence that my career prospects are fairly bright, for the foreseeable future and until I retire. So I know that there are places to work where one's experience one acquires with age is an asset, and not a liability.
I fully acknowledge that ageism exists in plenty of places. But I am just as well confident that there are plenty of more places where ageism does not exist. The place where I work invests significant resources in actively recruiting and hiring young skulls full of mush from nearby institutions of higher learning. Every summer we hire a bunch of co-eds for interships. Quite a few of them inevitably end up interning with us for a few summers, then graduate, and get hired.
At the same time, this place is full of beards. Quite a few folks here -- both IT and business people -- going to hit their retirement before I do. When a naming contest was held to name the conference rooms in new office space, I jokingly suggested naming them after employees with beards -- with the largest conference rooms going to the longest beards. Although this didn't happen, if it did there would be no shortage of names to pick from.
So, although every day I wake up being fully prepared for that day to be my last day at work, I believe the chances of me getting fired because I'm too old are absolutely nil.
Even if I'm wrong, or even if I get canned for other reasons, I'll simply look for a job without wringing my hands, shedding crocodile tears, and claim to be a victim of ageism. I refuse to be a victim. I will simply go look for, and find a job. That's it. If I interview and don't get the job, it matters little why, my first priority would simply be to land the next interview. That's what I'm going to focus on, instead of flagellating myself and wondering if I didn't get the job because I'm too old.
And I actually think I would avoid those places in the first place, saving myself the trouble (note to Facebook's and Google's recruiters, please stop spamming my Gmail mailbox, thanks).
I actually think that having places that overtly discriminate against older workers is a good thing. I believe that ageism is not the real problem, but it's always a symptom of some other, more deeply rooted, fundamental problem with the company. Even if they did not discriminate on age, I wouldn't probably want to work for them anyway.