Is 27 years old too old to compete in the ring?

[Little Apple]

It's older than normal, but I've heard of fighters in their 30's.

[silverfox79]

I'm 27 and recently I've been thinking of joining a muay thai school in hoping that I would someday compete in the ring. By the time I'm good I'll probably be in my 30's. I know the best thai fighters start when they are like 8 years old, sometimes even younger. Am I too old to win any real championships? Please be honest..thanks.