Hi all!

I recently purchased a somewhat larger old bungalow home that was built in 1901. Lovely house! In the front of the house on the right side sits a enormous camellia tree. When it bloomed several months ago I stopped counting the blooms when I reached a 1000 and I bet I was not half way through the tree. My question is this, with having no familiarity with camellias, some of the leaves are turning a tan-yellow brown color right now ( April 29th), is this normal? I live in Concord NC, and we have been in a drought for some time, but recently in the last 3-4 weeks we've had quite a bit of rain, more than last year. What would be the cause and should I be worried? This tree is about 20 feet tall and I have no idea but to guess at the age, perhaps 30 years old or more!?? This tree has been pruned much in the "core" of the tree, and the initial base of the trunk is big, roughly 24 inches + in diameter.