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Please suggest some alternatives as well.

Is this use of '–' OK?

"In 2006, when I was fourteen – early technological period for us – I got to see how a computer looked like, till that moment I had only heard rumor about computer."

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" In 2006, when I was fourteen -early technological period for us- I got to see how a computer looked like, till that moment I had only heard rumor about computer."

Is fine. It means the same as

" In 2006, when I was fourteen (early technological period for us) I got to see how a computer looked like, till that moment I had only heard rumor about computer."

BTW, try replacing how with what

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