You get pickier when you're older. You are busy, there's less free time, and you have to spend energy in a relationship.
Everyone wants to start the New Year's with a healthier attitude. A good friendship can boost your physical health and mental health, but a bad friendship can cause all sorts of emotional problems, resulting in anxiousness, depression and headaches.
It's a time to make a fresh start and make changes in your life.
If your instinct is that someone is not good in your life, then you should follow that instinct.