Is this concerning for ALT levels?

I had recent blood work, and every single thing was in range except my ALT. It was 52 and my AST was 29.

I don’t smoke, I don’t drink and haven’t in years. I eat pretty healthy especially compared to most people I know. I don’t have a gallbladder if that matters. I also just started running a lot and working out again and heard that can raise levels.

My doctor told me to get tested again in 3 months so he doesn’t seem that concerned.

Also, I am 30 years old. 5 ft 10 and weight 155 pounds.