I have the same thing. I'm 49 and my uterus is the size of a 12-15 week pregnancy. I also found out I have multiple fibroids and a mishaped uterus...only because I just had a CT scan for an unrelated problem.
Had a D&C to remove a polyp about five years ago, but my periods are just as heavy. I keep hoping menopause is at my doorstep, but I'm as regular as clockwork and really don't have any symptoms of the change...maybe a night sweat now and then, but nothing routinely or bothersome.
The fact that you are 53 and still have periods sure doesn't make me feel any better. I'm betting I'll be like you with the periods still going on while my friends will be looking at me and saying, "you still get a period?"!!!
I really don't know what to tell you. I've contemplated having a hysterectomy, but that is such a big decision and I keep hoping I'm close to the change. I've had a c-section so I know that kind of pain somewhat; plus the recovery time. I would never be able to have a vaginal hyst as my uterus is too large.
All I can say is do some research online and ask as many questions as you can to your doctor and see what she says. I do know that there are options, like an embolization (which my doctor no longer does). He said that sometimes that's only a temporary fix. There is also something called a myomectomy where only the fibroids are removed, but I don't know much about it.
Let me know how you make out, I'd love to discuss some options with my doctor as I'm going to see him in a few months. Good luck!