Are you suggesting that foreign workers are taking the same jobs that native Americans are retiring from?
Very unlikely.
About 75% of immigrants have limited English language skills.
In addition, the foreign university degrees that most immigrants bring to the USA are not accredited by USA employers.
Bottom Line - except for the Asian Indian software engineers, most foreign workers have limited skills and work lower middle class jobs.
No what’s more likely is that native born are moving up to take those jobs vacated by retirement and the jobs they vacate, some of them are taking up by foreign born.