They dont put 101 years old in their database they write in 1923.
When they made the booking program they had such limited memory for their computer that they just stored 23 and removed the 19.
The assumption was that the companies would continually update and redo their systems to fix this flaw as computers got more powerful.
Turns out that late stage capitalism is unable to make the small investments to keep up with infrastructure improvements so here we are with planes that fall apart and booking systems running on floppy disks.