(CBS) — Retirement is biting Generation X. Its oldest members will turn 62 next year, the earliest age at which people can claim Social Security benefits, with many Americans having too little saved to stop working even as the program faces its own funding crisis. Chris Branaman, 53, jokes that his retirement will be spent as a Walmart greeter. “That’s my funny way of saying I will likely be working in retirement,” said Branaman of Bay City, Mic…