When I got my first cat, he was a tiny kitten and I lived on my own and worked FT - but as it was only me, he basically slept all day and was awake in the morning and evenings when he got my full attention. He was a lovely cat, and very, very closely bonded to me.
Currently we have 1 cat who we rehomed when she was 18 months old, and a kitten - and I'd forgotten just how mad they are. I'd def go for a slightly older cat if you are out of the house a lot as they are more capable of amusing themselves