Early 1900s doesn’t mean 1900-1909. It usually means the early century (1900-1950). If they were born in 1945 then had a child when they were 30, that child would be 50.
Also, they might just mean that their mentality is like that of the early 1900s, not that their parents are necessarily that old.
kjo@discuss.tchncs.de 21 hours ago
Some people call before 2000 as 1900s.