My eyes were perfect until about a year ago when my left eye got blurry and I'm only 20. I was doing a lot of reading over the summer and my vision was just getting so blurry. It's only a very small difference from my right eye but it's enough to cause eye strain and very bad headaches. I guess the same thing happened with my Mom, her vision was great until she was a teenager and then she had to go get glasses.
You should definitely go to an optometrist and not just get reading glasses from a store though. My sister was about 6 when her vision started getting blurry, and they took her to the optometrist who said nothing was wrong with her eyes. Took her to the doctor and she had a blood clot that was pressing on her eye. Could've killed her if they didn't do something about it.
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