This is a two-fold statistical thing I want to pursue and I'm unsure of which test(s) to use. Using data of gender and age at time of death from a large, old cemetery in town I want to compare two things: 1. Average life expectancy of citizens of our town compared to the national average 2. Whether there is a noticeable difference in life expectancy after the development of major vaccines over the past 100 years. I'm figuring I will lump ages into groups of 5 years (died at ages 0-5, 6-10, etc) so there will be multiple groups, not including separation of genders. Thoughts?