Oh yeah, most of my characters have been with me for more than ten years. But I'm the type of person who gets attached to random things, like I had this spider in my bathroom and I gave it a name and everything and one of my friends came over and squished her and I cried
Rip Annabelle, you had so much to live for.
In all seriousness though, I feel like it's important to feel attachment for your characters in order for your stories to be relatable. Like if the creator doesn't care what happens to the characters, why should the reader?