[MatthiasPortzel]

If your goal is to encourage people to post more on blogs, why exclude all blogs created within the last 3 years?

[spdif899]

Unless I've missed something, they aren't doing that - the mention of a three year time frame is that you must have made a post on the blog within the last 3 years, this excluding old and dormant blogs

[MatthiasPortzel]

I read “must have a post at least three years old” to mean “must have a post which is three years old or older.”