When you click into a date field, the calendar pop-up will display the past year, current year, and 5 years into the future. If you need to enter a date that cannot be selected from the calendar, simply type that date into the date field.
You can not manually select the value 1989 from the standard date picker. but yes if you have a custom page then you can add a custom date picker.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script type="text/javascript">
var d = new Date();
var now = d.getFullYear();
var endYear=now-20;
var startYear=endYear-25;
$j = jQuery.noConflict();
$j(document).ready(function() {
var htmlStr='';
if(startYear<endYear){
for(i=startYear;i<endYear+1;i++){
htmlStr += "<option value=\""+i+"\">"+i+"</option>";
}
$j('#calYearPicker').html(htmlStr);
}
});
</script>
please refer this link
https://help.salesforce.com/articleView?id=000003739&type=1
You can not manually select the value 1989 from the standard date picker. but yes if you have a custom page then you can add a custom date picker.