void setDbiAge(int dbiAge) {
		this.dbiAge = dbiAge;
	}
Set the age as specified by the new DBI header.  A value of 0 corresponds
to the old DBI header
@param dbiAge age as specified by the new DBI header
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/AbstractPdb.java