We hardly think about our aging bodies. When they work well, we pay it little mind usually. In fact we often push the limits of our healthy state and operate on the fringe of over stress, high demands and overt body abuse.
And our bodies live in a symptom based medical world. We don't see people in the hospital until it's too late, after the symptoms appear and the ravages of disease have already begun. For those enlightened to prevention, they may be able to stave off disease to some extend, but in the end, our cellular "aging" will determine the health of our cells and our bodies made up of those cells. Only when our bodies stop working the way we expect do we really pay attention.
And then it happens. You wake up one morning and wonder how you got to this point. The arthritis hurts more often. The back ache is more common than not. Workouts are abbreviated by fatigue. The hair is grayer. The skin more saggy. They heartbeat more irregular or even painful. The skin reflects the over use of sun or other products. The wrinkles betray the age our mind thinks we are. The young treat us differently. The old treat us better.
And as the telomerase doesn't work as good and the chromosome shorten, and cells die off into oblivion of youth and health of the past, we start to pay more attention to our aging bodies and begin to try to figure out what we should have tried to figure while we were young.