Is it normal for a man to still live with his mother at 30 - 45

I would say usually not normal although it really depends on the circumstances.

There are scenarios where I think it would be considered normal for a 40 year old to live with their mum.

I don't think it's normal, but if he has a job and is helpful around the house, then I see no problem.

It's pretty common in my area. The cost of apartments and homes are too high here despite the fact that this town is an ugly worn down sack of crap. XD

It's all circumstantial. But for the most part, if everything's alright, not too normal. As in, not quite acceptable. Again, all circumstantial.
You gave a big age gap.

my dad lived with his mom until he was 60
then she died
he never really got a real job, but made a living buying and selling items
there really is an art to it

Depends on circumstances. Is he living there because he can't take care of himself, it is he living there to help his mother either with physical upkeep if the property or financially. I know guys at both ends of the spectrum. One lived with mommy until she passed away and now is having a hard time surviving because he never really cared for himself. On the other side, I know a guy who lives with his mother to see she has a place and is taken care of. He actually lived on his own for a while, but in her advanced years has mom moved in so he could help care for her. So this is a yes or no question, depends in circumstances.

It depends.

If a man lives with his parents beyond age 30, it is pretty unlikely he is going to find a relationship or even get laid much.

In the real world though, no one cares about someone else's living situation. People might say "loser" or whatever but it doesn't matter.

As long as you have a job and are supporting yourself then I think that's probably fine.

No, get a job and quit bumming off your mother. Everyone has to at some point. My great aunt literally lived with her dad until she was 56 and it almost destroyed our family. She was married and had a son, and they made such a mess for my great great grandfather. It was really a shame because he was the least abled body in the house, yet all three of them basically just took advantage of his hospitality.

My brother is 39 and still lives at my mom's place. He was working in Seychelles ISland for two years, then came back and lived with a woman for another three years and now they are no longer together and he is back home. I dont thinnk that he will ever move out. He will never be able to afford a house and here there is no such thing called apartment. We have only houses and very few rent.

my best advice is to either get a job and move out, or study to get a better jot so you can move out