<As you get older, you get closer and closer to retiring, so the time you have to return the investment made by the company in you is just not enough to justify

<As you get older, you get closer and closer to retiring, so the time you have to return the investment made by the company in you is just not enough to justify such investment.> That argument makes sense... in 1980. In the modern era of frequent job-hopping, who is more likely to jump ship the next time a competitor dangles something shiny in front of her/him? The 25-year-old or the 50-year-old?