How can i improve my flexibility for Tae Kwon Do?

Ask your master for help he should be able to show you exacly what you need to do and about being too old, give me a break I hope not because i just started and im 23. I was wondering the same thing though when I first showed up but theres a guy there who was a green belt and hes in his 60's. He always wanted to practice tkd but thought he was to old until he got old enough to stop caring about his age and do it. Good Luck.