What are the general thoughts among other companies about hiring someone (early 40's) that has worked at one company for 20+ years or more? Obviously I stay on top of tech over the years, get to play with lots of toys and infosec is front and center of my daily grinds.

I can't help but wonder if I'd be marketable though if I were to look around. Would any hiring managers here prefer that sort of experience or steer clear of it?

EDIT: I'm not asking for interviews, I'm very blessed to have the job I have...it's just good to reassess one's worth from time to time I suppose.