Employers will often provide a final date to sign a severance agreement before it is revoked and becomes null and void. In addition, employees over the age of 40 are entitled to a 21-day window in which to review their severance package if they were terminated as an individual, rather than as part of a group lay-off. If the over-40 employee’s termination was part of a group layoff, that timeframe is increased to 45 days. Employees over 40 also have at least 7 days after signing a severance agreement to revoke it by providing notice to their employer or former employer within that time period.