A 95 year old will probably not be able to do hard exercise, such as running fast for one hour per day. The heart of such a person won't have the capacity to pump the required amount of blood through its body. However, most 95 year olds won't visit the doctor complaining about not being as fit as they where at the age of 25, any complaints about feeling tired, lack of energy etc. will typically be considered to be normal for the age.
But one can ask if in fact the aging of the heart is equivalent to having (mild) heart failure. Suppose that when I'm 95 years old I disguise myself, making myself look 25 years old. I then visit some doctor complaining about not being able to exercise at a reasonable intensity. If all sorts of tests are done, would I be diagnosed with heart failure? And would treatment for heart failure for healthy 95 year olds allow them to exercise at an intensity that is much higher than what could be considered to be normal for that age?