Is it outdated to use an HTC Windows Phone 8.1

[Pusya]

Hi all!
I was wondering if there's someone who still uses an HTC Windows Phone 8.1?
I know it's quite old, but I find myself very comfortable using it. It has all the functions I need so it doesn't really bother me.

So do you still use it?
And also, is there any way to modernize it?