Expect to see the medical market grow at about a 20% annual rate, says MRPC VP of Business Development Greg Riemer. The Butler, Wisc.-based contract manufacturer (mrpc.com), says the reason is that one-third of the U.S. population will be 50 or older by 2010, up from one-fourth in 1991. To maintain active lifestyles, they will demand implants such as joint or hip replacements, pacemakers, and additional surgical procedures. MRPC makes medical components using a wide range of material such as silicone, synthetic natural rubber, thermoplastic elastomers, and thermoplastics.