Powershell file watch

I am very new to this, the script I have is beyond me.  I need this script to find a specific file that is older than 5 minutes and email me.  The script does email me with files that are older than 5 minutes, but I need to look for a specific file.  What do I need to add or change to do this?

$src="c:\test\"
$sendmail=$false

 Get-ChildItem -path $src -Recurse |
 Foreach-Object {
       #write-host $_.fullname
      $dtdiff = New-TimeSpan ($_.CreationTime) $(Get-Date)
     
        if ($dtdiff.minutes -gt 5)
        {$strbody=$strbody +$_.fullname+ " - Created Time: "  +$_.CreationTime +"`r`n"
        $sendmail=$true
        }       
}
#$strbody
if($sendmail -eq $true){
# Email components
$strFromAddress = "it@it.com"
$strToAddress = "me@it.com"
$strMessageSubject = "REPORT"
$strMessageBody = $strbody
$strSendingServer = "mail.it.com"

# Email objects
$objSMTPMessage = New-Object System.Net.Mail.MailMessage $strFromAddress, $strToAddress, $strMessageSubject, $strMessageBody
$objSMTPClient = New-Object System.Net.Mail.SMTPClient $strSendingServer
$objSMTPClient.Send($objSMTPMessage)}