I'm just getting starting on my second carree, looking for advice

Go for it man. Nursing is a really cool place for a man. It's tough and demanding,and the pay stinks, but let me tell you this one 2nd careerer to another, nursing is the greatest.
You will bond with female collegues on a level that most men would envy. You will learn a new type of respect. And you will recieve that respect in return.
Your patients will benifit from a mans binary perspective. Get it, a thing is either right or wrong. You will learn how to temper that to a specific situation.
I envy you just starting out. It is especially exciting in the beginning. Like jumping from an airplane. Or free climbing a rockface.
ENJOY!

The kids will try to kill you.

To add tho LJ's comment. Volunteer a few hours per month to a VA hospital, retirement, or AFC care facility, you get to learn allot about bedside care and the patients/residents will benefit from you also.

I am starting my pre requisites in September and am scheduled to start nursing school in  a year.  I am 54 and have worked as a supervisor for the last 6 years and eligilble to retire.  I have had this calling to get into the medical field for most of my adult life, but got married and had to support 4 kids so changing careers was not an option.  I am excited about my decision to start nursing school (by the way one of my daughters is also starting at the same time) and would like to talk with other guys who went into nursing as a 2nd career.  Am I crazy or is this actually doable at my age?