Are DMVs deprecated in 2014 SQL Instance?

I'm SysAdmin on a SQL Instance which is 2014 version.

I'm not able to get the results for my DMVs. I'm trying to find the PLE and cache hit ratio using below queries. Its not erroring out but its not giving any results.

--PLE

SELECT[object_name],[counter_name],[cntr_value]FROM sys.dm_os_performance_counters 
WHERE[object_name]LIKE'%Manager%'AND[counter_name]='Page life expectancy'

--Cache Hit Ratio
SELECT (A.cntr_value * 1.0 / B.cntr_value) * 100.0 as BufferCacheHitRatio,A.counter_name FROM sys.dm_os_performance_counters  A
JOIN  (SELECT cntr_value,OBJECT_NAME FROM sys.dm_os_performance_counters WHERE counter_name ='Buffer Cache hit ratio'
       AND OBJECT_NAME like '%Buffer Manager%') B ON  A.OBJECT_NAME = B.OBJECT_NAME
WHERE A.counter_name = 'Buffer Cache hit ratio' AND A.OBJECT_NAME like '%Buffer Manager%'