Unfortunately, even if you have been a green card holder for 28 years, USCIS will look at the last 5 years for your required physical presence. This means that you must have at least 30 out of the last 60 months inside the US in order to be approved, among the other requirements. The only way around that is if you were spending that time outside the US because you were employed in one of these categories https://www.uscis.gov/policymanual/HTML/PolicyManual-Volume12-PartD-Chapter5.html
If you were not employed in one of these categories, then unfortunately you would not be approved until you have 30 months out of the previous 60 months in the US.
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