Hi, I went back to work 4 years ago after nearly 20 years at home - I was terrified. I saw the job in the local paper, just 4 weeks work which I thought would ease me in. I fully expected them to say TOO OLD (I was 53), but 4 years later I am still there! Actually I have just had my review and I am one of the best workers !
Scottishmags is right, start small, go to an agency then your confidence will build - go for it, you will be fine.
Good luck ++