I didn't have a c-section, but after almost 3 yrs, my chest scar still itches/feels irritated daily. It's so annoying. I think it has to do with the nerves trying to reconnect.
DD is 28 months and it still bothers me occasionally. It will get itchy or irritated if I wear something that rubs it wrong, or will just randomly itch and be annoying. Not every day anymore, but maybe every couple of weeks.
DS will be 10 months on Monday and it just recently has started itching. For me it has something to do with DS playing mommy jungle gym and climbing all over me, inevitably rubbing his foot against the clothing over it.