Tracy,
Go for it - there's nothing better than doing what you love.
I'm 57 - I've been in music since 1964. I had to drop gigging from the age of 32 until I was 46 because I was raising my daughter on my own. I started a band at 46, because I wanted to do it again. We were gigging after 2 months. Once you get that music thing in your blood, the only cure is to do it.
Unless you can actually write music notation to get your original songs down, you might consider getting a little hand-held recorder with a built in mic. Then, when a melody comes to your mind, you can just sing it into the recorder, so you don't forget the melody. You can always write the lyrics down, but I find that if you just write down the lyrics, it's easy to forget the exact melody, unless you make an audio recording of it. (The quality on those is pretty poor, but it's good enough to capture the tune.)
All the best to you.
