A plot of age against time, consisting of lines inclined at 45° representing the lifetimes of individuals. Each line starts with birth (or
Lexis diagram. Diagonal lines show lifetimes of individuals; vertical lines show points in time. There were three people aged 60 at the beginning of 2001. Of these, one died later that year aged 61. In 2002 a 61-year-old immigrant entered the population.
immigration into the population) and ends with death (or emigration from the population).