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In terms of any sort of compensation claim, he'd have to allege that he was not permitted to return to work due to his age.
The problem though is that such claims have to be brought before the EEOC within 180 days of the alleged event of discrimination. Even using the very last day of April (when they are normally calling people back to the seasonal work), the 180 days passed at the end of October, so he would be time barred from bringing a federal claim. He'd have to rely on a state level claim and would be limited to the damage under the state statutes, so he would have to contact the state Human Rights Commission there.
As for unemployment, seasonal employees can get that, but again, he'd have to have made that claim when he would have gone back, which was 26 weeks ago. Unemployment only has 26 weeks of eligibility, so he'd be time barred from applying for that too.
I don't disagree that he had some potential claims here, but regrettably, we are talking about those rights too late.