Viva la IBM
Seems a tough road to hoe for the plaintiffs to emerge successfully based on the complaint. Between IBMs legacy mainframe installations [read: 90% marketshare] firmly entrenched throughout banking, transportation, finance, healthcare, government sectors, in addition to continuing Service Level Agreements, along with their pivot back to concentrating on new mainframe installations in lieu of SMB server, PC desktop, mobile seems purposefully targeting older experienced workers would be counter to their business interests.
Not that businesses cannot/do not shoot themselves in the foot, but most that survive 100 years, world wars, great depressions, probably not so much.