Do people who are the same age have similar personalities?

I get really irritated with my co-workers sometimes. We had a co-worker who was up and down, hot or cold personality. She left for another job, and then there is this other co-worker, he's more easy going but blows up and breaks things when he gets angry, and he is exactly the same age as that one co-worker... show more I get really irritated with my co-workers sometimes. We had a co-worker who was up and down, hot or cold personality. She left for another job, and then there is this other co-worker, he's more easy going but blows up and breaks things when he gets angry, and he is exactly the same age as that one co-worker that left.
Update: They both have mental problems, I just find it kind of interesting that they're personality sometimes seems so much alike.
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