Websites - 720px Width .. Don't Do It.

About 3-4 years ago, I did something really idiotic when making my website.  I made it 720px wide so even people using prehistoric computers wouldn't have issues once they visited my website.  I knew then that would be a small amount of people and that wouldn't last for long.  Now years later, I need to change that.  Either a full 100% width with some padding or a 1080px min width is a must.  It's going to take some time.  For the people who know they're doing something stupid but do it regardless like myself, don't be one of us.  Be better.  Don't fucking code with 720px width.  For the people who can't see it because they have such old computers, your grandma will be allright.  Code it right.