[libreoffice-users] disable 2-digit options

Good evening
I am using Calc to maintain a list of patients including entries like 
name, age, date of birth etc.
I tried to set a consistent style to about 20 different sheets.
Sheet styles do not allow to adjust font etc.

I choose character style to set the desired font for all sheets.
Problem:
I DID set a certain "date format"
and
a certain "number format".

However, this gives me either an incomprehensible 5-digit number for the 
dates (of birth),
or alternatively a similarily incomprehensible 5-digit number for the 
age = 2 digits.

I found under:
Tools - Options - General -> a "Two digit options":


   Year (two digits)

Defines a date range, within which the system recognizes a two-digit year.

In LibreOffice, years are indicated by four digits, so that the 
difference between 1/1/99 and 1/1/01 is two years. This *Year (two 
digits)* setting allows the user to define the years in which two-digit 
dates are added to 2000. To illustrate, if you specify a date of 1/1/30 
or later, the entry "1/1/20" is recognized as 1/1/2020 instead of 1/1/1920.

That may be wonderful in certain situations, but leaves me having to 
choose between the "age" (MOST of my patients have a 2-digit age!!!) or 
"date of birth" of my patients.
And, naturally, having to format those columns by hand, for all sheets 
(and maybe all eternity)
AND ... my patients turn out to have a VERY strange "date of birth":
70 ("age" translates into ) 1900/3/10
25                                   1900/1/24
33                                   1900/2/1    (I am sure, there is 
some logical rule, but I cannot see it)
The above cited help section does NOT indicate any way of how to 
*DISABLE *that function.
Is there a way to do so?
I tried to just delete the number in the year field. THAT did not work.
Any help would be greatly appreciated.

Thank you.
Thomas


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