Career move from Mainframes to big data or data science?


I am a mainframe professional with 12 years of experience working mostly as an individual contributor and an SME in my business domain. I am looking at skilling myself on data science area. But on discussions with some of my peers, I was told that data science is not a related field to mainframes. Can you suggest which area(out of big data, analytics, data science) would be relevant considering my background of mainframes?