Hi Steven,
Plain and simple, just do it. You'll only regret not doing it and the longer you wait the harder it will get. I am 35 and I'll be starting a masters in geology this fall. Many schools appreciate older students because we are viewed as being reliable, consistent, experienced, and hard working. I was offered a TA position and was told that my years of work experience played a role in them offering me the position.
Hope everything works out for you.