Rollup value from Child object To Parent Object Using Aggregate Result Query

Requirement: Update Total Age on Account from contact.
Write a trigger on Contact, When Contact record will insert with age value update the total age on Account of child contacts,

 Create Age number field on Contact object
Create Total Age number field on Account Object
trigger updateTotalAgeonAccount on Contact (after insert,after delete ,after update) {
set<Id> accountIds = new set<Id>();
list<account> updateAccounts = new list<account>();
if(Trigger.isUpdate ||Trigger.isInsert)
{
for(contact c : trigger.new)
{
accountIds.add(c.accountid);
}
}
if(Trigger.isDelete)
{

for(contact c : trigger.old)
{
accountIds.add(c.accountid);
}
}

 //run the query to sum the data
AggregateResult[] totalAges= [select  SUM(age__c)totalAge,accountId  From Contact where accountId IN:accountIds group by accountId];

System.debug('totalAges@@@'+totalAges);
for(AggregateResult ar: totalAges)
{
Id thisAccountId = string.valueOf(ar.get('accountId'));
Account thisAccount = new Account(Id = thisAccountId);    
thisAccount.Total_Age__c = double.valueOf(ar.get('totalAge'));
updateAccounts.add(thisAccount);
}
update updateAccounts;

 } 

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