I'm almost 30 and single with a six year old. I feel really unsatified with my working life and working future as there it is very unskilled "office" based work, mainly with young people and college students. I don't hate work by any stretch and I think that's partly the problem. There is no real opportunity to progress especially as I'm restricted with what hours I can do so my earning potential is fairly low and fulfilment is equivalent unless I go and retrain but I have tried this (evening college) but it wiped me financially, time and energy wise plus I did it on a whim and chose a subject that didn't really interest me!
I would love to hear stories of people who retrained later in life. I'm interested in psychology, addiction studies, sociology, counselling etc which are all a bit wishy washy in terms of employment (as in, do nursing you're a nurse, engineering-engineer, accounting etc)