The five years exempt (not counting days) on F-visa is only allowed once in Lifetime. Therefore, you are considered as a US resident after your first five years expired.
Per IRS, as a student you are exempt for 5 calendar years. This is a lifetime exemption. So once you used up the 5 years, you cannot be exempt again on a F1 or J1 student visa.
For more information, click here: https://www.irs.gov/taxtopics/tc851
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