My son is the youngest of 5 and I knew when I was pregnant something was amiss. By the time he was 8 months old I knew he was this 'thing' called autism that I'd heard about in a half page article in the Womans Own. It still took years though to get him a diagnosis due to where we live and there being no expertise. He was diagnosed aged 4 by the late Lorna Wing, one of the world authorities on autism, she told me she knew as soon as she set eyes on him. For my son there was no regression - nothing every really started to happen and he has a diagnosis of Classic Kanners Autism which means he exactly fits the bill for autism at the most severe end of the spectrum - autism as describe/termed by Kanner decades ago.
He didn't speak until he was 8 but when he did it was obvious he'd been soaking up information like a sponge. He's never been to school, I did home ed with him, and it was the best thing we could have ever done for him. He's still at home with us and over the last few years his mental health has deteriorated and he now requires 2 to 1 round the clock care. We have a team of 4 live in carers working with us but I still have him on my own, with people just a heartbeat away, for bedtime etc and early morning. I finish his day and start it. I also spend a lot of time with him during the day but the sad thing is that no one can ever be alone with him just in case.
And on top of his mental health issues that manifested about 4 years ago, it can happen to our loved ones, he also has a diagnosis of Tourettes.
My son is independent and cooks, cleans, does laundry, looks after his dog, goes out for meals to carefully rehearsed places, he was well travelled until recently and has been worldwide. He also works out with a personal trainer 3 times a week and he walks 4 kms daily as well as rowing the same on is rowing machine, and the same again on his cross trainer. He also swims 20 laps of our 60 foot pool every day. His sensory issues means that physical actively is a huge part of his day.
Our house was purpose built so we can have him at home, he is the youngest of 5 and he's an uncle 5 times over. He has a good life all things considered and is really well integrated into our community but its fair to say that the life he has is not what we had planned for him and we were on our way to making happen before he was hit with his mental health issues.
Someone way back said it was nicer to say Child with Autism and I'd just like to say that not everyone is bothered about the terms people use. It can be really hard keeping up with the latest term to use even as parent of a young man this age.