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My dad was 45 when he thought [in|out|up|on|through|with|over] the idea that he wanted to change a profession dramatically. He used to work as an engineer in a local factory but he caught [in|out|up|on|through|with|over] that he wanted to become a computer designer. He applied for a local university and began to study.

It was so difficult for him to keep [in|out|up|on|through|up with|over] his mates, young 18-year-olds, but he didn't want to drop [in|out|up with|on|through|with|over] of the course.

I am proud to say that he didn't give [in|out|up|on|through|with|over] and finished the course last year. He's been working for a small company for half a year now. He is successful and quite happy.