Hi, I am aware that this is a question of style, but... When and under what condition would you start a sentence with Even as a boy, I ... I see this as the standard form.
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Clive
Hi,
Even as a boy, I ... I see this as the standard form.
Even back as a boy, I ... This, I see as an informal, rather 'folksy' expression. 'Back' seems redundant, and just seems to add a bit of emphasis, a feeling of distance from the time of speaking