Your lower leaves are yellowing/falling off from lack of proper light and because you've been vegging so long. Make sure you are on 12/12 light cycle. Flush your plant if you have any GROW nutrients in your bucket. Begin with a decent helping of BLOOM nutrients immediately after your flush. Do not mix grow and bloom nutrients. At this point adding grow nutrients will not help yellowing/dead leaves as someone else mentioned. Also forget what a different person mentioned about nutrient lockout, don't even commit it to memory. Follow a schedule for the kind of nutrients you are using. Get yourself a TDS/PPM meter if you don't have one and make sure you aren't over-fertilizing your plants. Try and keep your TDS at 1000PPM or less. A problem many people have when they veg for as long as you, is that once the plant is actually in flowering, it drinks like mad. If your foilage is healthy, drinking 2gal. a day is not abnormal. All that drinking will cause PPM fluctuations and if the roots drink it all your plant could die. So keep an eye on that water level daily. Flush your plant at the end of grow. Make sure you harvest it at the right time, not too early or late.
If you are seeing white hairs that is a good sign, are they on the tips of the branches (buds) or coming out of the sides of the branches (preflowers/female pistils)? I would say post a pic, but since you have 7 posts and they are all on this thread, perhaps you might consider not asking any more questions. Instead, start researching what it takes to effectively grow marijuana... including looking at the many pictures on this site of plants in the same phase as yours. once you understand a bit more, ask away.... just a thought. cheers and good luck!
mr.bond