If they plan to have no Soc Sec and Medicare like the Texan separatists want to do, it drives all the older folks back to the US, giving a much lower cost of government. It also provides a large supply of lower cost housing for the population as they exit and most sell their residence.
Why would it drive older people out of Texas if there is no SS? People in other countries can draw their SS no matter their citizenship. Older people will live there for the lower cost of living, and spend their checks from Uncle Sam there too.