Finding age of administrator accounts on multiple machines in AD using powershell?

How would we search through multiple AD objects (machines) to find the password age for the account Administrator? I'd also like limit it to a search group. Here is what I have thus far:

Param
(
       [Parameter(Position=0,Mandatory=$false)]
       [ValidateNotNullorEmpty()]
       [Alias('cn')][String[]]$ComputerName=$Env:COMPUTERNAME,
       [Parameter(Position=1,Mandatory=$false)]
       [Alias('un')][String[]]$AccountName,
       [Parameter(Position=2,Mandatory=$false)]
       [Alias('cred')][System.Management.Automation.PsCredential]$Credential
)
       
$Obj = @()

Foreach($Computer in $ComputerName)
{
       If($Credential)
       {
              $AllLocalAccounts = Get-WmiObject -Class Win32_UserAccount -Namespace "root\cimv2" `
              -Filter "LocalAccount='$True'" -ComputerName $Computer -Credential $Credential -ErrorAction Stop
       }
       else
       {
              $AllLocalAccounts = Get-WmiObject -Class Win32_UserAccount -Namespace "root\cimv2" `
              -Filter "LocalAccount='$True'" -ComputerName $Computer -ErrorAction Stop
       }
       
       Foreach($LocalAccount in $AllLocalAccounts)
       {
              $Object = New-Object -TypeName PSObject
              
              $Object|Add-Member -MemberType NoteProperty -Name "Name" -Value $LocalAccount.Name
              $Object|Add-Member -MemberType NoteProperty -Name "Full Name" -Value $LocalAccount.FullName
              $Object|Add-Member -MemberType NoteProperty -Name "Caption" -Value $LocalAccount.Caption
      $Object|Add-Member -MemberType NoteProperty -Name "Disabled" -Value $LocalAccount.Disabled
      $Object|Add-Member -MemberType NoteProperty -Name "Status" -Value $LocalAccount.Status
      $Object|Add-Member -MemberType NoteProperty -Name "LockOut" -Value $LocalAccount.LockOut
              $Object|Add-Member -MemberType NoteProperty -Name "Password Changeable" -Value $LocalAccount.PasswordChangeable
              $Object|Add-Member -MemberType NoteProperty -Name "Password Expires" -Value $LocalAccount.PasswordExpires
              $Object|Add-Member -MemberType NoteProperty -Name "Password Required" -Value $LocalAccount.PasswordRequired
              $Object|Add-Member -MemberType NoteProperty -Name "SID" -Value $LocalAccount.SID
              $Object|Add-Member -MemberType NoteProperty -Name "SID Type" -Value $LocalAccount.SIDType
              $Object|Add-Member -MemberType NoteProperty -Name "Account Type" -Value $LocalAccount.AccountType
              $Object|Add-Member -MemberType NoteProperty -Name "Domain" -Value $LocalAccount.Domain
              $Object|Add-Member -MemberType NoteProperty -Name "Description" -Value $LocalAccount.Description
           $Object|Add-Member -MemberType NoteProperty -Name "Password Age" -Value $LocalAccount.PasswordAge
        
              
              $Obj+=$Object
       }
       
       If($AccountName)
       {
              Foreach($Account in $AccountName)
              {
                     $Obj|Where-Object{$_.Name -like "$Account"}
              }
       }
       else
       {
              $Obj
       }
} 

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