The way I see it, it depends on what a "maintained" project looks like for you. For me it means there is a team is actively accepting new Pull Requests from other developers. There's also activity in the bug tracker and constructive comments on PRs. I consider specially important that the maintainers are currently accepting contributions. These mean that there's a community around it that still cares about the development of the software.
Some people are OK with one or two developers working on it on and off for the last few years. I would not base a commercial project on this, but it can be OK for small experiments or personal projects.
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The way I see it, it depends on what a "maintained" project looks like for you. For me it means there is a team is actively accepting new Pull Requests from other developers. There's also activity in the bug tracker and constructive comments on PRs. I consider specially important that the maintainers are currently accepting contributions. These mean that there's a community around it that still cares about the development of the software.
Some people are OK with one or two developers working on it on and off for the last few years. I would not base a commercial project on this, but it can be OK for small experiments or personal projects.