Top Boston philanthropist Carl Shapiro is reportedly facing a criminal probe into his ties to Bernard Madoff, although experts say it’s not clear the 96-year-old Hub man will ever face charges. “When you hit 96, I think you get some immunity,” said Willis Riccio, former New England chief of the U.S. Securities and Exchange Commission. The Wall Street Journal reported yesterday that Shapiro is one of at least eight Madoff associates targeted by a probe into Madoff’s $65 billion Ponzi scheme. Others include Shapiro’s son-in-law Robert Jaffe - a part-time Weston resident who allegedly served as Madoff’s Hub salesman -...