Yes, it can stay current. -- Backup your data 1st for the love of God...
Open a terminal and type in
Then give it your user password.
Now, you're root.
Run this one next.
apt-get update -Vy
The command will run and as long as your network is good, you'll have no problems.
Now run this one, which may take a while. Of course, you can minimize but NOT close the terminal in the background. You might have to restart the system when you are through.
apt-get dist-upgrade -Vy
One hour ++ maybe or maybe not and one reboot and you have the latest and greatest version of Mint.
Of course, backup ALL your data and applications first.