Join Two Separate Select Statements Into One

I have two seperate tables that I need to get the data into one select statement. Here is the two separate select statements that I have created.

Select AGEGROUP, [YEAR], SUM(CASES) as Cases FROM tbHosp a
LEFT JOIN tbAGEGROUP b on a.AgeGroupID = b.AgeGroupID
LEFT JOIN tbYEARHOSP f on f.YEARID = a.YEARID
LEFT JOIN tbSEX g on g.SEXID = a.SEXID
where a.AgeGroupID in (1,2,3)
and a.YEARID in (1,2,3)
Group BY AgeGroup, [YEAR]
ORDER BY AgeGroup, [YEAR]

Select AGEGROUP, [YEAR], SUM(POPULATION) as [Population] FROM tbPopulation a
LEFT JOIN tbAGEGROUP b on a.AgeGroupID = b.AgeGroupID
LEFT JOIN tbYEARHOSP f on f.YEARID = a.YEARID
LEFT JOIN tbSEX g on g.SEXID = a.SEXID
where a.AgeGroupID in (1,2,3)
and a.YEARID in (1,2,3)
Group BY AgeGroup, [YEAR]
ORDER BY AgeGroup, [YEAR]

Results - First Select with tbHosp

AgeGroup YEAR CASES
<1 2001 9
<1 2002 32
<1 2003 10
1-4 2001 13
1-4 2002 11
1-4 2003 23
5-9 2001 13
5-9 2002 14
5-9 2003 34

Second Select with tbPopulation
AgeGroup YEAR POPULATION
<1 2001 40686
<1 2002 39768
<1 2003 40438
1-4 2001 174346
1-4 2002 170191
1-4 2003 167223
5-9 2001 247071
5-9 2002 242548
5-9 2003 237816


What I am trying to do is get one result set with Population and Cases together like the following

AgeGroup YEAR CASES POPULATION
<1 2001 9 40686
<1 2002 32 39768
<1 2003 10 40438
1-4 2001 13 174346
1-4 2002 11 170191
1-4 2003 23 167223
5-9 2001 13 247071
5-9 2002 14 242548
5-9 2003 34 237816

Any help would be greatly appreciated.

Thanks!