My father's mother, May ,was born in 1900 and was 15 in 1915.
I must say I never saw any sign that the horrors of the Great War, 1914-1918, had ever effected her much.
I think this was because she grew into her formative teenage years under circumstances never seen before or since in Manchester England.
Her father Eddie made his living installing mule spinners into Northern England's cotton mills and I never appreciated just how good his business was, during May's early years ,until I re-read David Edgerton's SHOCK OF THE OLD.