v1.64 is still the latest version of the cpan script in bleadperl. However, v1.80 is the oldest version of the CPAN module in its changelog.

This is my Ubuntu system (which is old, but not ancient):

% cpan --version 2>&1 | grep cpan
/usr/bin/cpan version 1.64 calling Getopt::Std::getopts (version 1.12 
+[paranoid]),
% perl -MCPAN -E 'say $CPAN::VERSION'
2.18
%
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