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Yes, you can divide a Violet.
The links will below will help you.

https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm
https://www.gardeningknowhow.com/houseplants/african-violet/tips-for-easy-african-violet-propagation.htm
https://www.gardeningknowhow.com/houseplants/african-violet/fixing-leggy-african-violets.htm

Over time, the plant will age, just like us. This can cause them to wear out.

Alternatively, they could just need a good dose of fertilizer! This article will give you more information: https://www.gardenfocused.co.uk/plants/chinese-lantern.php

As with most plants, it's best to divide African violets when they're not in flower or have few flowers so they can put all their energy into root and leaf growth. However, it's not critical, and if you propagate by division while they're flowering, they will probably be fine.

This is possible, so I would suggest using both "blue" and "red" spectrum. Horticultural bulbs are abundant, and those are the most two common light spectrums. Although it is not the best source of light it can be worked with, as long as you are careful. You will have to find the balance between too close and too far away. This will be tough, as there is a very small margin of error. It is best if you have multiples to experiment with, just in case there are some casualties (believe me I have killed thousands of plants). There will be no harm in trying, though.

The tightening of the crown leaves could be caused by many reasons, but amount of light, watering and nutrients are generally the biggest issues.
Review the link below.
https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm
You should transplant them once a year!

bottom under the oldest leafs. The ones that do grow in the crown, turn grey and mushy. I've tried moving them, and re-potting them. I've had them for 15 years and they have always been beautiful and healthy. I don't know why this happening. Help!!