how many years can i make file t1 adjustment

i did not realize that the t4a from co-op refund is not a taxable income and I did include them on my tax returns many years. how many years can I go back to make adjustments and since my income amount affect both of our earnings do I have to make adjustment for my spouse as well. can I do it online with cra more than 1 year. thanks, kristine.

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