Windows 8.1 drops extended support in 2023. Windows 7 already ended in 2020.
Despite this, 12% of windows users globally, and 6% of USA users, still use Windows 7. This is actually larger than the share who still use w8.1 (3% both USA and globally)
Why is continuing to use Windows past its support deadline dangerous? And if it is dangerous, why are there still SO MANY windows 7 users?
Nothing's stopping you. I've seen enterprises still running Win7, XP, 03, you name it. They still make plenty of money. You just shouldn't be, especially if you aren't computer savvy, for the reasons other commenters have pointed out. SMBv1 vulnerability comes to mind, but I know there's way more.
Are you trying to do something specific on an old OS or is this just a general question?