Aging is an irreversible biological changes that occur in all living things with the passage of time.  Among humans, the effects of aging vary from individual to another. 

The study of different aging processes that occur among individuals and the factors that cause these changes is known as gerontology.  While  the medical specialty concerned with the diagnosis, prevention and treatment of diseases in the elderly is called Geriatrics.

Many people do not experience declines until very old age, and the great majority of the elderly learn to adopt to the limitations imposed by health problems.  In general, the health of older people today is superior to that of previous generations.  A condition that is likely to improve still further as more people receive better medical care throughout their lives.  You may look up to your father in  many ways but sometimes he needs to look to you for help with his health. 

Here are some pointers when talking about health with your dad shared from a psychologist:

•  Find the right time.  Research shows that stress levels fall faster in the afternoon than they do in the morning, which means your dad will be calmer and more ready to listen if you talk to him after work.  Remember be casual, natural, intimate and non-threatening.  Don't broach the topic while eating and you're stressed.  It causes a spike in cholesterol levels, which increases the risk of heart disease for both of you.
• Research your father's illness.  Use the library, the web, and friendly physicians to research your father's illness.  The more you know about the illness, the more you'll appreciate exactly what he's facing.  Thus, when you approach him, you'll sound a bit more intelligent.
• Change for the better.  It could lead to better habits elsewhere if he commits to one healthy change.  In a study of 103 elderly men and women those who engaged themselves in a regular physical activity for a year also gradually improved their eating habits.  So, if you're primary goal is to help your dad get fit, change his diet, find a better medication, or choose a health-care facility says a co-author of Difficult Conversations.
• Remind him how he used to feel.  Make him remember how it was like to be in shaped,  According to a professor of human development reminding him how much he loved playing basketball in high school could renew his interest in exercise.
• Ask for your father's help.  One of the biggest hurdles you face is role dynamics:  Your father is used to being the authority and caregiver figure, with you as the obedient child who has to take him seriously.  Now suddenly, he feels those roles have been reversed.  Your attempts to give him lecture or make demands will only make him feel ignorant , guilty and angry.  Play the role of a son or daughter who need his dad's help.  See to it that what Dad will hear is his son or daughter asking for advice or a plea that should tug on his fatherly instincts.
•  Listen and repeat.  Nobody takes advice until he feels understood.  So listen to how he feels and what he fears.  Don't contradict or interrupt; then repeat it back to him.
• Moment of truth.  When you and Dad put together a health plan.  Set aside time, three or four times a week to work out together,  You know you work out more regularly if you do it with a buddy.
• Reward his success.  Give your dad incentives to stick with the program.  Get him a senior membership at a well-appointed gym; you can gently remind him that it's a waste of money if he doesn't go.  Or you might promise that the grand kids will visit  every Sunday to take a walk with him.
•  Nagging won't change your dad's behavior.  Brandeis University researchers found that older folks are less likely to listen to advice if it's persistent, especially if it's about their health or finances.  Nagging won't change your Dad's behavior.  Instead let your Dad know when you notice improvement in his health or habits.  This will encourage him to stick with the program.

Health discussion tend to be sensitive and difficult.  There is no reasons why your father will not appreciate your effort if you can keep it intelligent and keep in mind after talking comes action.