40 is not equal to 40

As I stated in my last post, 40 doesn't equal 40.
From a mathematical point of view this is totally wrong of course. However in life this is definitely true.
My mother had me at 40. The same age I am now.
My Mom was fun and active. She always knew what was cool and trending. She had amazing skin and hair. All around she just seemed younger. In fact compared to most of my friends my Mom always seemed to be the young one, even though she was the oldest. Often by at least 10 years. I was the kid with the cool Mom.
Now here I am at 40. Unlike my Mother my energy is pretty low. Even though I like to think I am pretty cool, I know I am not as in touch with what is hot and what is not as I would like to be. I already have crows feet and kind of a lot of gray hair.
Life just isn't fair. But what is it that keeps her so young for so long and has me aging much faster.
I don't think it is life stress. While I am sure it plays it's part, my mother had a hard life. She lived through a war (and yes she was a Child in Germany during WWII, so she really lived through war) She was sexually assaulted at a young age, had an abusive first husband, and raised 4 boys on her own. Then at 40 (20 years after her oldest and 16 after her youngest) She had another baby with her second husband.
My life on the other hand has been pretty easy. I had supportive parents (who yes had their problems, but who doesnt?) I met my husband in my very early 20's and here we are still happily married after all these years. We do have our occasional problems, but he is most definitely not abusive. I only have two Children and they are 9 years apart. So really stress isn't it... .well unless it is stress that has kept her young.
It could be general health I guess. My mother has had diabetes and high blood pressure for as long as I can remember, but other then that she has been pretty healthy.
I am healthy on the books but I do have a severe wait problem that causes me problems. It doesn't take much to wear me out and I spent probably a good 4 years in a constant  state of pain. I have only actually been pain free for a few months, and part of me worries it is just temporary. I am sure that has a lot to do with it.
Maybe it is just attitude. My Mom always said she never knew how old she was until she looked into a mirror. I on the other hand am always very aware of how old I am, how many more years before I hit a certain age, or before my Children will reach a certain mile stone in life.
I think that might actually be a big part of it. My mother always lived for the moment  (now that she is 80 and my father passed she lives in the past and age has definitely caught up with her) where I always have been planning what will come next.
So I guess my goal should be to live more in the now. (Feel like that is a contradiction some how lol)
I might not turn back the hands of time but maybe I can slow them down.