Facing the Fear of Ageing

I'm afraid of getting older. My body has done nothing but declines with time/age and I'm not even in my thirties so I'm terrified of living in this body through old age. I've defeated death more times than I can count since birth. So why?? I'm fighting the decline with everything in me and still, it's not enough so what am I fighting for??? Old age?? More time I don't want??? To see what was once left of my youth be ripped away from me and torn to pieces?? I'll be older and decline more I admit that but It's too much grief to handle if I admit that this is my youth-my peak in life-my younger years-where the story just begins because it feels so impossible to bear...im not suicid@l right now I swear I'm just......different I guess maybe