Good Luck. I was in a similar position to yours some 17 years ago. My youngest son died at age of 25 years, and in an effort to try to sort out my life I applied for a part-time job. This was in 2002, and I had not been in paid work since 1969 when I had my first child.
Even on the morning of the interview I had to keep talking myself out of panic mode. I was 61 years old and had been out of the employment market for over thirty years. I had, however, done unpaid voluntary work as an administrator and this served to get me that job I was being interviewed for in the NHS.
Over the following nine years, I increased my hours, upped my grade and made lots of friends and had a wonderful time, finally retiring just prior to my 70th birthday.
Do let us know how you get on, fizzers, even if this one does not turn out successful, keep going.