The values for the typical ages at birth, between generations, etc., can be set in the {{man menu|Menu -> Edit -> Preferences -> [[Gramps_5.2_Wiki_Manual_-_Settings#Limits|Limits > Calculation limits]]}} tabor you can manually change it as described below.

{{man tipwarn|You can only change the following configuration file|<code>~/.gramps/gramps.ini</code> <br><br>'''if Gramps is not running.'''}}

The date ranges taken used by Gramps are set by keys. These If not present these keys can be added to your <ttcode>~/.gramps/gramps.ini</ttcode> file. Eg<abbr title="exempli gratia - Latin phrase meaning 'for example'">e.g.</abbr>, you could add to the <tt>behavior</tt> group:

;;date-about-range=1050 ;;date-after-range=999950 ;;date-before-range=999950

These Those are the default values. If you want to have that before only reaches back 100 years on matches, give insteadremove the double semicolons before them makes Gramps ignore them and change the numbers to match this:

date-after-range=999950