Hi Mayank!
Yes, you can start with the gym. The right age to start with the gym is 18; also, it depends on your body type. People in sports start at a very early age only. To lose your body fat, I suggest you have black coffee before you start your workout and also eat papaya pineapple for post workout. Eat plenty of greens and chicken skin out pieces; this will help you lose body weight. I suggest you check your BMI before starting with the gym, so based on your report, your workout and diet will be customised.
Thank You!

Hi Mayank, there is no particular age to get into fitness. Earlier the better. I would suggest you to take personalized coaching which will focus on your core areas and get nutrition as specified by your instructor. However, be aware of genuine instructors in the area who can aim on getting you maximum benefit.

Hello Mayank!
Yes, you can start working out at the Gym. You should focus on resistance training for your workouts. Regarding fat loss, you need to have a calorie deficient diet. In this context, it is always advisable to have a personal trainer for your workouts and to consult a nutritionist for a proper diet plan.

For your first part of the question, the answer is yes. The gym is just a place or facility to achieve or fulfil your fitness goals which don't have anything to do with age in most of the cases.

When it comes to fat loss, slow, steady cardiovascular activities like cycling, running, swimming or any other activity which demands you to intake more air/oxygen and your legs are moving will lead you to fat loss because these activities utilise fat/lipids as the primary source of energy. When it comes to diet make sure that you are balancing out your calorific intake, eat less junk/unsaturated fats, feed more on fibrous food, whole grains, veggies, fruits, little bit dairy for proper fat intake.  It is only for fat loss, muscle building and strengthening is another topic to talk about. I hope this helps. Do let me know if anything more is required.

Ofcourse you can start now. The best way to loose fat is to intake less calories and burn more calories. Any form of exercises you can do. Like functional training, weight training, body weight training, resistance traning or you can always combine any of this for weight loss and muscle gain. All the best.