You are and will be who born ya'.
I was a marathoner my whole life. I did strength training and yoga regularly. Until I had to have both knees replaced and a quadruple open-heart bypass and valve repair surgery, where I almost died, 8 years ago. My docs said it was in my genes for my knees and heart to fail at 62 and 63, not the exercise. Both happened to my dad at the same ages and he never exercised a day in his life.
Now I walked briskly for 40 minutes everyday and do weight training 3 times a week. I watch my weight and don't eat any processed carbs, starches or sugars. Sugars are the bane of the human body.
I am 70 years old now but I am mistaken for 54-56 quite regularly. The biggest factors, why I "look" younger? My wife says it's my oily skin (prevents so many wrinkles) and I have a full head of long, thick hair. No balding, thinning spots or receding hairline. My dad died at 80 with a full head of thick hair. He looked 65 or so, when he passed away.
So look to your parents for how you will turn out in old age. Their ailments will be yours as well.
Genetics loads the gun lifestyle pulls the trigger.
You must be Irish to have so much great hair :)