Age makes employees less flexible in some senses like not being willing to put up with some of the crap that younger people will (60 hour weeks, endless crunches, etc.) I once did, but will no longer tolerate that crap from an employer.

But being older doesn't mean you stop learning, adapting to change, or lose the ability to deal with moving targets. I'm hopping rapidly between roles and widely varied tasks at my current gig better than I would have in my 20s or 30s since I've got more perspective and experience.

A more mature person might point out that if your plans change weekly you likely have a systemic problem, though, and would be more likely to point out the breakage.