Vinod, age is no bar for leaning anything. If you are confident and determined then why not, enrol for the classes, do not worry about what others say.
Make your body flexible, go for walks, In the beginning it may seem difficult, but as you practice, it becomes easy for the body movements to be picked up. Be regular in your work and practice consistently. Training and hard work will make you to reach your goal.
Eat healthy food to keep you fit and active. Have a balanced diet, include leafy vegetables, fruits, cereals, wholesome grains and lean proteins. Keep a check on your body weight. If you gain weight it becomes difficult to practice, learn the steps/moves easily and you get tired.
Make your dream come true, it is good to train young children in dance, this would help to keep your self active and being in the company of children gives you happiness.
There are different levels in learning the dance, interact with a dance teacher to get a better idea about the particular type of dance you wish to learn, according to your choice, your age and your personality and the time duration for learning the dance.
To make your body flexible, learn simple yoga exercises, exercises like stretching, bending, swinging arms can be practised, avoid watching too much of TV. Indulge in activities that makes your body to work.
If you have any medical issues consult the doctor seek advice and act accordingly.
Wishing you the best.