private LocalDate parentDateIncrement(final LocalDate date) {
        final int years = typicals.ageAtMarriage()
                + typicals.gapBetweenChildren();
        return plusYearsAdjustToBegin(date, years);
    }
private LocalDate parentDateIncrement ( final LocalDate date ) { final int years = typicals . ageAtMarriage ( ) + typicals . gapBetweenChildren ( ) ; return plusYearsAdjustToBegin ( date , years ) ; }
Adjust the given date by age of parent at first child.

@param date the input date
@return the adjusted date