Under the Older Workers Benefit Protection Act (OWBPA), the 21-day review period and 7-day revocation period begin only after you receive the final written severance agreement, not during an earlier phase where the company may present approximate terms or ask you to indicate interest in a buyout. Companies often structure these programs in two steps: first, an election window with estimated details and a deadline to participate, and second, the formal agreement itself. While they can set deadlines for the initial election, they cannot override your federal rights once the actual agreement is provided, you are still legally entitled to the full 21 days to review it and 7 days to revoke after signing.