| how.old | Determine numeric age |
| lexis.age | Emphasize a certain age in Lexis grid |
| lexis.cohort | Emphasize a certain cohort in a Lexis grid |
| lexis.grid | Plot a Lexis grid |
| lexis.hmd | Fill Lexis triangles by HMD data |
| lexis.lifeline | Plot lifelines into a Lexis grid |
| lexis.year | Emphasize a certain year in Lexis grid. |
| lifelines_sample | Data for 300 random lifelines |
| prepare.hmd | Prepare HMD data for 'lexis.hmd()' |
| what.date | Determine the date a certain age is reached |