Yes, as you get older the flexibility is harder, especially in a male due to the muscle build up around your shoulders and back.
They key to great flexibility in male gymnasts is to start them young and continue to develop the flexibility while the boys are building muscle.
But it is not too late to improve your flexibility to some degree, even if you have already gained a lot of your adult muscle.
Chat to your coaches about the best stretches for your needs and do them every day.