date picker range slider

Hello,

I have a problem with the age filter on the member directory the slider does not indicate the age but only minimum and maximum. Surprisingly when I use it the age appears in the URL of the web browser.

I checked

Age: {min_range} – {max_range} years old
Age: {value} years old

And here

/**
		 * @param $filter
		 *
		 * @return mixed
		 */
		function slider_range_placeholder( $filter, $attrs ) {
			switch ( $filter ) {
				default: {
					$label = ! empty( $attrs['label'] ) ? $attrs['label'] : $filter;
					$label = ucwords( str_replace( array( 'um_', '_' ), array( '', ' ' ), $label ) );
					$placeholders = apply_filters( 'um_member_directory_filter_slider_range_placeholder', false, $filter );

					if ( ! $placeholders ) {
						switch ( $attrs['type'] ) {
							default:
								$placeholders = array(
									"<strong>$label:</strong>&nbsp;{value}",
									"<strong>$label:</strong>&nbsp;{min_range} - {max_range}",
								);
								break;
							case 'rating':
								$placeholders = array(
									"<strong>$label:</strong>&nbsp;{value}" . __( ' stars', 'ultimate-member' ),
									"<strong>$label:</strong>&nbsp;{min_range} - {max_range}" . __( ' stars', 'ultimate-member' )
								);
								break;
						}
					}

					break;
				}
				case 'birth_date': {
					$placeholders = array(
						__( '<strong>Age:</strong>&nbsp;{value} years old', 'ultimate-member' ),
						__( '<strong>Age:</strong>&nbsp;{min_range} - {max_range} years old', 'ultimate-member' )
					);
					break;
				}
			}

			return $placeholders;
		}

I found a workaround by creating a field where users simply indicate their age, but I would like to know if you have a script based on the year of registration to add more 1 years to the age indicated

Thanks for help