simple - check file, if found how old? if less than a specified hour email alert

Hello All

I'm new to PowerShell and have found a lot of information and examples in the forums but I'm stuck and need quick help.

I need to check a shared drive for specific files - specific suffix actually. If some are there I need to check how old they are, if they are between 0 and 3 hrs old do nothing, but if they are older than that email and alert with the list of files in an email.

I'm wondering if someone has a script that already does this? or close to it and I could modify?

thanks

john