Universal Time or Greenwich Meridian Time (GMT)

Getting the Universal Time - GMT

Select GetDate() as LocalTime

Select GetUTCDate() as GMT_Time

GetUTCDate Returns the datetime value representing the current UTC time (Coordinated Universal Time or Greenwich Mean Time)

Select DateDiff(second,GetDate(),GetUTCDate() ) as DifferenceinSec
will give you the difference between GMT and your Local Time

GetAge - Get Age Using SQL Query

How to calculate Age using SQL Query

DateDiff function can be used to get the Age from the birth date

Select BirthDate, DateDiff(year, BirthDate, getdate()) as Age from HumanResources.Employee