I suspect it's exceptional that someone can do physical labor for 40 hours a week for 45 weeks a year for 60 years.
The common response is, "Well, yeah, but you should retire at some point." And that's a fair response, but farm workers are severely under-charging if they expect to work for 30 years (to make up a number) and then be retired for 25+ years.
Farm workers are not charging. If they had the market power to set a price, they wouldn't be doing farm work.
In any case, the political/economic response has been to move up the age of retirement, which isn't helpful to the long term knee health of the hypothetical farmer worker here.
We only really live about 6 and a half years longer than we
would prior to the industrial revolution on average. This
relatively modest number is obscured somewhat by overall
life expectancy averages which are buoyed by drastically
reduced infant mortality.