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Older microwaves specially can emit frequencies well out of their designed range and they can escape but usually only if the barrier has been damaged. Back in HS when I was doing first robotics, our sponsor BAE had a microwave from the mid 80's that they warned us not stand by while it was cooking because it did actually leak out microwaves - and they even proved it. It can happen but I'm not sure how common it is. Your best bet in replacing your current one is to measure the electricity usage and compare it to newer ones ratings. A big part of being eco-friendly isn't just reducing power consumed but also reducing new goods being consumed because they use a lot of power to get the materials (recycle or mining/drilling), construction, and transportation, and the power used to get rid of the old one properly.
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