There are no rules but each to their own. It's a bit like a birthday... does it mean you should renew yourself? Why not?
The purpose of New Year is it's the shortest or longest day of the year (close to it... the 21st/22nd Dec) and the days are getting longer or shorter again... depending on what side of the equator you live. And a year lasts 365 1/4 days. Time to start the calendar all over again.