I'm not peruvian, so I don't know their average life expectancy between 1900-1979.
But I imagine it would be bad, compared to after year 2000.
I am pretty sure of that, because my own country life expectancy after year 2000 is way way better compared to before WW2 end.
https://ourworldindata.org/life-expectancy
The life expectancy at birth in 1940 Peru was 37. (The closest year to her son birth year)
Also the life expectancy at birth in 1950 for Peru was 43, and as for global average it was 46 years.