Can I still be a railway station security inspector at the age of 43?

You can't. Requirements for recruiting railway station security personnel:

1, support the Constitution of People's Republic of China (PRC), abide by national laws and regulations, voluntarily engage in ground security inspection and conductor work, be able to keep work secrets, and have the spirit of loyalty, dedication and hard work.

2. Age 17 to 35.

3. Male height 170cm or more, female height 160cm or more.

4. Technical secondary school or above. To sum up, 43 years old is too old to be a railway station security inspector.