how to do get details of matched male profile based on female age lessthan male age

if @gender='male'
      begin
      set @gender='female'

begin
       select top 8 p.Reg_id,dbo.getage(DateofBirth,GETDATE()) as age,r.Height,p.Religion,p.Caste,r.District from dbo.matrimony_Personaldetails as p left outer join dbo.matrimony_register as r on r.Reg_id=p.Reg_id where Religion=@religion and Gender=@gender and Height<=@Height and DateofBirth>=@dob
       end

else
        begin
        set @gender='male'
        if @caste='any'
        begin
        select top 8 p.Reg_id,dbo.getage(DateofBirth,GETDATE()) as age,r.Height,p.Religion,p.Caste,r.District from dbo.matrimony_Personaldetails as p left outer join dbo.matrimony_register as r on r.Reg_id=p.Reg_id where Religion=@religion and Gender=@gender and Height>=@Height and DateofBirth<=@dob
        end