PARIS (AP) — Large swathes of France’s workforce, spanning generations, will go on strike Thursday to protest the government’s planned overhaul of the pension system.

Gathering in Paris, they want to vent their anger at the reform proposals that President Emmanuel Macron thinks are necessary to make the pension system financially sustainable.

Vincent Le Faucheur, 23, will be marching with his uncle, 41-year-old Gilles Pierre. Both work on France’s railways and both are ready for an “unlimited strike” that could potentially paralyze the economy nationwide for days, even weeks.

“The older ones have fought for us. It’s normal we fight for ourselves and for the future generations,” said Le Faucheur, who joined the national railway company three years ago. “Yes, it will be difficult, but if we need to do it, we will.”