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Thinning skin is a consequence of sun exposure over the years and of normal aging. Of course, the best plan is not to expose the skin to the sun, but that isn't something you can do at 70+. The best skin routine is to use the same anti-aging treatments you use on your face, although this can be more expensive. You need skin care that contains ingredients to help replace collagen, such as non-prescription retinol (prescription Retin A is available but far more expensive), alpha-hydroxy acids, and peptides. If those are outside of your budget, you can use really rich moisturizer creams like CeraVe or Cetaphil. Some people swear by creams that contain CoQ10.
LED light treatment is fairly new and some people say they see a difference after a couple of months of treatment. Others see no difference. There isn't enough medical information to recommend it.
Easy bruising can sometimes be a result of medications like blood thinners (coumadin, Plavix), corticosteroids, and even aspirin and non-steroidal anti-inflammatory drugs like ibuprofen and naproxen. You can speak to your primary provider to see if drugs might be a cause. Lack of vitamin C, lack of vitamin K, lack of micronutrients. It's best to eat a diet containing lots of green leafy vegetables, lean protein, and whole grains.
Please let me know if you have additional questions about this.