I'm 51. I do high intensity interval cardio at least three times a week. I also lift weights three times a week, sadly no more than 30 pounds. The weights have toned my thighs and arms where cardio couldn't. Yoga I do at least twice a week for an hour. Yoga is amazing for your body but you won't lose much weight doing it (in my experience).
I usually stick to the Beach Body videos and now subscribe to Beachbody on demand. They really do have the best of the best home exercise videos out there.
Diet and exercise together. Whole foods and I don't cook with any kind of oil. Stir frys for dinner with mushrooms, spinach, onion, green peppers, garlic, soy sauce and any other kind of green veggie. Celery, bok choy, broccoli, cauliflower, grated ginger. Basically any veggie you have in your fridge or you want to add. Use water when needed instead of oil. The fat you eat is the fat you wear.
Breakfast is oatmeal with half a banana and a kiwi or with frozen fruit, depending what I have. Or a green smoothie in my Vitamix containing spinach or kale, cucumber, apple, lemon, ice, water, parsley, or whatever veggies I have on hand.
Lunch is a HUGE salad of mixed greens, chopped apple, cucumber, kale, red peppers, cherry tomatoes, parsley or whatever salad stuff I have in my fridge. For salad dressing squeeze a whole lime into greens and mix. Top about 5 tbsps of hulled hemp seeds. Delicious and almost zero fat.
Berries and watermelon are extremely healthy too. I usually eat one or two pieces of fruit a day and the rest of my diet is veggies since most fruit contains a lot of sugar.
Potatoes are great, no oil or butter, roasted on parchment paper for crispness with parsnips, Brussel sprouts, onions, carrots, beets.
I also cook tofu quite a bit and I don't eat bread or rice for the most part. About once a week I will eat quinoa.
This way of eating for me is a lifestyle not dieting. I don't have to weigh anything eating like this. Basically I eat as much as I want. Moderation dieting has never worked for me, nor counting calories or weighing food.
Eating and exercising this way has allowed me to maintain a slim, toned (for 51) figure.