The short answer is no, you are never too old to start training Muay Thai.
In Thailand, most people start training Muay Thai when they are very young, often as young as 4 or 5.
For people who are less interested in going pro and just want to learn self-defense, get in shape, and maybe compete in a few low-stakes competitions, there is no age limit.
Alby began his Muay Thai training at the age of 27 and he knows people who are several decades older than him who have thrived after starting in their 30s, 40s, or 50s, though they did face some limitations.
Con: Your Body Changes Another downside about starting Muay Thai at an older age is that it takes longer to recover.
While going pro may be too ambitious for those who begin training Muay Thai later in life, there is no age limitation for those who want to use Muay Thai as a way to get in shape, learn self-defense, and become part of a community.
This can make it very difficult to regularly go to the gym Muay Thai.
You may be able to schedule one-on-one sessions with an instructor and to build out a home gym.
As Alby says, this allows us to fight smarter, not harder.