I started,rather restarted, college at 30 years old. Now I am 35 and heading full steam into the last semester of my first year in a Ph.D. program!!! All the while doing this with 2 children, one who has Autism and husband. I use to think the same thing about my age,but in my interview I played it up as a benefit. I said things like, I know what it means to be in the real world, so you don't have to question my comitment to your program. Also, my age allows me to understand concepts and theories in a real world way that some younger classmates may not really get yet. In the end, I think it shows that you know what you are doing.
Finally, I have never been so personally satisfied. Going back to school was the best decision of my "own" life. Hope this helps!!! Good luck following your dreams!