A nice piece, Mario, about the nuances of aging. Some responses.
At 64, I have no desire to be young of body again. I feel younger than I did as a teenager, who felt very old. I am never old in my dreams, only in the mirror. I think how we approach our stage in life reflects why we believe we are here in the first place. For me, it is a journey of awakening to the Self that forever exists beyond time. the body exists in time and will do its thing. I Am not that, so I do not care about making it look young. I exercise and take long hikes (with my beloved staff), to honor this vehicle and to be able to utilize the talents given me and to serve.
I believe that people obsess about being young is to avoid facing the inevitable, and have not established a relationship with death, and thus they have not found freedom in living.