Mine are at 260,000 Km, and I'll bet they are original. That's about 160,000 miles. I wouldn't be surprised if the shoes are original too. I ground the 'lip' off that prevents the drum from slipping off easily. Read through this thread:
When they're easy, you take off the wheel, grip the drum with your finger tips and slide them off. Park brake must be OFF (don't forget that).
Be sure to use the proper lubes and don't replace the shoes (or drums) without measuring. (see the provided link)