Note this list of 9 count 'em 9 IRS free file options.
IRS Free File | Internal Revenue Service
Each one has specific requirements (or not) as to age, income levels, etc.
But my previous experience with filing software is that not all accept foreign addresses.
Taxact does but I don't fit their age requirements for free file.
Not sure which one to check out on the list.
You can also just fill out a manual online free file form but I'm too used to software that I'd really rather not.