There's an old saying that age is just a number, but some battling the job market right now might disagree. In the last few years, Karen Lumis shifted her career from corporate marketing to academia, public speaking, even starting her own business, but that was never the plan. >> I had no idea when I entered this market that there was ever going to be a ceiling, a barrier of some type.>> She says she never had trouble finding a corporate job until she hit her 50s. Across social media, some career experts ar ...