Corn snake becoming aggressive

[GreenMachine]

So we’ve had our corn snake from a very young age. Hes about 5 yo now. He’s normally been very calm and docile. Pretty much laid back all the time. Enough that we’ve never had an issue letting our children hold him under our supervision. But here recently he’s began striking at me whenever I go to pull him out for handling, feeding, cleaning, etc. I’m not sure what to do or what the issue could be. Nothing about his environment has changed for over 1.5 yrs now. He eats regularly, water and tank are changed/cleaned regularly. I’m just not sure what has made him become so aggressive. Any help or suggestions would be appreciated. Thanks in advance.