Functional relations from cradle to grave

We are born into a world where everything is new, and everything must be learned. When we look at the functional relationship between a child and its environment, we usually find an explosive learning curve and lots of behavioral cusps. This early period will set the stage for our adult life. The functional relationships are with us every day. But as we get older and older these functional relationships will break down. Change is inevitable. Our body is slowly deteriorating and activities that we previously longed to engage in, will become activities we dread. This may be due, for example, to osteoarthritis where just getting out of the chair can cause great pain. Loss of hearing and vison problems will certainly change the reinforcing effect of our favorite activities. Now imagine these things happing to you and not being able to tell anyone about it. Either because you don't know the right words or because you just don't know what is happening to you.