You should talk to your doctor first, but, probably fine to do, especially if you do fly alot. But, people honestly worry too much about stuff. I know it is hard not to, but it can be done. I don't mean to preach or lecture but what you are feeling is normal people don't realize that sometimes. Just the other day, my oldest son, so old at 26 said to me, " man, I am getting old." My God, I got to be ancient for I gave birth to him, 26 YEARS ago! Today, on the phone, I had to listen to the machine message, first it said, to push the language I wanted, but failed to give me an option of any. So, I stood there looking in the holes hoping it realize its own folly. But, the woman on the machine came back saying, " you didn't select a language." I stood there thinking, well, I do have my blonde moments but if I can understand you, it must be English? Eventually, it got disgusted with me not entering anything even though I was pushing anywhere from the number 1 to 10, so it gave me another option. I sat down, got my coffee put it speaker phone, if I had a cigerette I would lit it, and listened. This message was giving me age brackets! "From age 19 to whatever push one... I felt really old by the time it had hit mine ten minutes later.
So, we are really only as old as machines make us feel.