Retiring at 50 has long been a guarantee for parts of China's working class — until now

• China announced on Sunday that it's planning to raise its retirement age.
• Experts say it's a move that's been needed for a long time, despite fierce backlash online.
• In China, some women get to retire at 50 — even when their life expectancy is over 80 years.

Buried under scores of paragraphs, a single line in a new document from Beijing has shaken China's workforce.

The country's leaders, who convened last week to discuss their economy's direction, revealed dozens of resolutions on Sunday — including their desire to raise the standard retirement age.