'First' not supported in SQL Server

I am using following query in access

Select first(fname),age from mytab group by age

Database :

Sam 21
Raj 21
Karan 21
John 23
Rocky 23

O/P of Query :

Sam 21
John 23

I want to use the same query in SQL Server,But First keyword is not supported in SQL Server.So how can I write my own function 'first' in SQL Server, so that I will not need to change above query in SQL Server also and it should give same result.

Use
Select TOP2 * from [tablename];

I Hope this would solve your querry!