I LOVE your bun!  It is very sophisticated looking.

A decision to cut your hair would obviously be a major decision and one that should not be taken lightly.  As you said - you've had long hair all your life and it is part of who you are.  You should only make the decision to cut it if YOU desire shorter hair. 

Age is really not a factor.  I know many "older" women with long hair.  Personally I find long hair easier to care for than shorter hair.  It does not have to be styled daily, I do not require regular trips to have trims/cuts, I have variety in how I wear it.

If you feel your current length is more than you can handle, you might try trimming it to classic length first.  (Classic is at the bottom of your rear.)  If after several months, you still feel like it needs to be shorter, you might go to tailbone.  Trimming it in this fashion allows you to get the feel for the shorter length without losing a lifetime of length.

I hope this might help you with your decision, but I really hope you chose not to cut it short.

I so love your hair!   It is so beautiful!  I also agree with bikerbraid - if you feel you need to cut it, to go in stages.  The choice is ultimately up to you, and how you feel about it.

Thank you so much for sharing your pictures!  You are an inspiration.

Thanks a lot everyone here.I am glad to have more confidence to keep my hair long.

Sleeping style is not a problem.I always put my hair into one loose braid.I can put it wherever i want.Because braid won't be tangled.

And if i decided to cut my hair, i would not cut it to short by 2 or 3 times.Because i think if i cut it ,i would not grow it that long again because of the age. So i would like to cut it to very short ,so i can keep the entire braid for memory.What do you think?

Do you really think my bun is ok?Thanks again,and it is also hard to buy a hairnet that can hold all my hair in .Very big net is hard to see.

I think if you are going to cut it, be careful about cutting it that much at once!
I cut 14" off my hair once so that I could donate, and because my hair is so thick, I was very dizzy and lightheaded for a couple of days.
Also, it can be kindof a traumatic shock to cut that much at once.  Make sure you are fully prepared for the emotional reaction you may have - it can be powerful.

The bottom line is - make sure that what you are doing is because YOU want to do it.
It's the only way to make sure you are happy with your decision!

Why don't you find one of those websites where you can submit a picture and try out different hairstyles.  I suspect those urging you to cut haven't really thought about what you would look like.  I predict, if you did cut it, that more than one would say, "It just doesn't seem like it is you." 

But I agree with the ladies here.  If you like it the way it is, keep it that way!