Let's be careful not to conflate life expectancy and life span. The former being dominated[1] by improvements in reducing infant mortality and mothers dying during child birth, while the latter has remained largely consistent[2],[3].
‘… life expectancy in the mid-Victorian period was not markedly different from what it is today. Once infant mortality is stripped out, life expectancy at 5 years was 75 for men and 73 for women.’[1]