Occurrence of clash for recording Date of Birth between by Age and by birth-date

While filling the form for registering new client,
The Validation message received(when negative numbers for example -8 is entered) for recording Date of Birth by Age Please enter a value between 0 and 120

where as for recording Date of Birth by birth-date the datatype input has years starting from 1879(which means 140 years till now)
so here in this case there is no such limitation.

Even after selecting such big year (Ex 1879 March 23) The form is accepting without any errors.