Year function reteives different values

 
SELECT year(convert(date,'24-10-49',5)) --dd-mm-yy

--2049

SELECT year(convert(varchar(10),'24-10-49',5)) --dd-mm-yy

--2049

SELECT year(convert(date,'24-10-50',5)) --dd-mm-yy

--1950

SELECT year(convert(varchar(10),'24-10-50',5)) --dd-mm-yy

--1950

Do we have any range for year function or do SQL server shows values to only limited period??