concreteduck
There are no presets for 1080p60 upload to YouTube using the Premiere Elements 12 Publish+Share/Social Websites/YouTube feature.
But, you can export your 1080p60 Timeline content to a 1080p60 file saved to the computer hard drive, and, from there, upload the file to YouTube at the
You Tube web site. There you can get any extended time if needed by applying for one of YouTube extended time accounts which can be used there but
not within the Premiere Elements upload to YouTube feature.
To create your 1080p60...for now I will assume that you need 1920 x 1080 @ 59.94 progressive frames per second....if you need 60 instead,
then just set for 60 instead of 59.94 in the Export Settings dialog.
Publish+Share
Computer
AVCHD
with Presets = MP4 - H.264 1920 x 1080p30, and, under the Advanced Button/Video Tab of that preset you are going
to customized your export settings for 1080p60 (1920 x 1080 @ 59.94 progressive frames per second.
Check the estimated file size before you hit the Save button.
The Export Settings customized should look like
(any problems setting the Frame Width or Frame Height - click on the box to the right of those entries to remove any
chain link that may be there. My screenshot shows the chain link.....also, any problems in this matter, set the Level and
Profile, and then enter Frame Width and Frame Height.)

If your Estimated File Size is larger than wanted, then experiment with lowering the Target Bitrate and Maximum Bitrate
to try to arrive at a compromise between bitrate, file size, and end product quality.
Please review and consider, and then let us know if that worked for you.
Thank you.
ATR