I wonder how accurate those statistics are. For example a dozen years ago I was called a programmer, now I am called a project manager, but I still work in software in the same group for the same employer - about as good longevity as you can get. It may be that seniority leads to job relabeling that misrepresents the true situation.
The real question is whether the people who "drop out" of the statistics still wanted to be "programmers" at 40.
What percentage of mechanical engineers still work as "engineers" a decade after graduation? The stats for CS majors are meaningless without a baseline for comparison.
The real question is whether the people who "drop out" of the statistics still wanted to be "programmers" at 40.