Loads of good advice on here. I would just like to make two comments.
You are not too old and you will not be too old in 10 years time. A close relative of mine trained as a teacher in her late 40s and went on to teach full time for nearly 20 years. She went from a woman with her children reared and her life behind her, to a whole new life and career. This was more than 20 years ago when such things were more unusual than they are today.
Secondly you have just made a major career change. Give yourself at least a year trying to make the best of it before you decide on another change. What can your new colleagues be thinking, "this guy just joined us and already he's unhappy" give them a chance and give yourself a chance in this role.
You are not too old and you will not be too old in 10 years time. A close relative of mine trained as a teacher in her late 40s and went on to teach full time for nearly 20 years. She went from a woman with her children reared and her life behind her, to a whole new life and career. This was more than 20 years ago when such things were more unusual than they are today.
Secondly you have just made a major career change. Give yourself at least a year trying to make the best of it before you decide on another change. What can your new colleagues be thinking, "this guy just joined us and already he's unhappy" give them a chance and give yourself a chance in this role.