For all the guys over 30 on here telling you to go for it there are probably twice as many sitting silent at home wishing they didn't.
You will certainly encounter age discrimination even if you don't notice it at the time. Many operators simply don't like hiring older guys and girls because they generally stand up for themselves more and are less inclined to bend the rules. Another strange phenomenon is how people get hired. It seems more like a popularity contest than a merit based recruiting system sometimes.
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