Shirley S. Abrahamson was born December 17, 1933, so on her next birthday she will be 78 years old. So all Gov Walker and the Wisconsin State Legislature need to do is set the Judicial Retirement Age to 78. Pretty simple, eh?
Wisconsin State Constitution, Article VII, Section 24, part 2: "Unless assigned temporary service under subsection (3), no person may serve as a supreme court justice or judge of a court of record beyond the July 31 following the date on which such person attains that age, of not less than 70 years, which the legislature shall prescribe by law"
Old Shirley turns 78 on December 17, 2011, so her last day on the Court would be July 31, 2012.
David Prosser turns 78 on December 24, 2020, so under the new retirement age of 78 he would have to leave the Court on July 31, 2021. But that's when his current term ends anyway.
The rest of the Wisconsin Supreme Court Justices, with their birth dates and when their terms end. I'll let you do the math:
- N. Patrick Crooks (born May 16, 1938)
- Patience D. Roggensack (July 7, 1940) 
- Ann Walsh Bradley (born July 5, 1950)
- Annete K Ziegler (born March 16, 1964) 
- Michael J Gableman (born September 18, 1966)
Please forward this to all the Wisconsin Republicans you know. Thanks!