I think I'll create a scenario to show everyone how, I think this works. Because, there is a clear difference between "needing" and "doing."
We don't need to go to Mcdonald's and grab a big mac, it's not like Mcdonald's is forcing us off the road into their parking lot. And in fact we don't need one to survive, but that doesn't mean we can't do that.
As Davem says "needing" suggests there is a choice to choose whether to "count" the years or not. "Needing" suggests, it's not "necessary" that they do so, but they can. Where "They don't count the years," simply means, they don't do it, there's no choice in it, they just don't do it. Tying it back with Mcdonald's, we don't need to stop and grab a big mac, it's not going to keep us from dying, but just because we don't need one, doesn't mean we can't go and get one. If we were to say, "I don't go to Mcdonald's to get a big mac," that means I don't do it at all, there is no choice. Where if I say, "I don't need to go to Mcdonald's," would suggest, it's not "necessary," that I go to Mcdonald's but that doesn't mean I can't still go to Mcdonald's.
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