If they're still working full time, then it isn't retirement. Retirement is an economic situation, not an age.
It's not that surprising when you look at the numbers. Average retirement savings accounts for those on their 60s is around 600k, but median is around 200k. Meaning some people are doing really well, but most won't have much. Average retirement age is low 60s, and average lifespan for a60 year old is about 20 years. A 4% withdrawal for the average retirement account and roughly 2k per month SS check is about 50k per year before taxes. Not great but you can survive on that, but then look at the median and this drops to a bit over 30k. That would be tough, especially if you don't own your home or have major expenses like Healthcare.