Well happy belated birthday
@Pandora. Don't worry life is not over.
Get enough sleep, avoid sun exposure (nothing ages you faster than the sun.....but this advice is more for the teens and 20 somethings out there, because the reckless sun exposure you get in youth crops up later in life as sun spots and damaged skin.) When I was 20 a waitress I worked with got skin cancer from the tanning beds (big thing in the 80s and 90s).....and after that I almost completely quit sun tanning (I never did the tanning beds) and I started protecting my skin rigorously. Its paid dividends as I have minimal sun damage compared to many of my peers. Even now when I walk I wear long pants and longsleeves and a hat to protect my skin from UV exposure.
Vitamins, healthy diet, no smoking, light alcohol consumption (if any), exercise, sex and fun.
I am still regular as far as cycle (annoying but my body thinks I'm years younger than I am)....and while I wish menopause would show up already, late menopausal women have the highest longevity. Add to that the fact that women who are 10% underweight by BMI also have the greatest longevity (I'm working on getting my BMI from 21 back to 19, but 18 would be better....) At a light BMI there is less tissue to maintain, less wear & tear on the skeletal system, less digestive burden & less oxidative stress.
So I think about all those things. Stress reduction is also important. Stress creates too much cortisol which is harmful to the body if chronic.