45 is still hip, I am 45. I have no kids and never married. Put up your feet, relax, I am sure you have earned it!! Reap the benefits of having your life back.
I haven't worked in over 10 years and I am never bored. I live on the ocean and have a gigantic social circle.....so go outside and play!! LOL

45 is still very young. Join a gym, get in shape. Do a complete makover, hair, clothes, etc. Then you decide whether you want to take some courses at the community college or night school. If you're financially secure, go on cruises, travel. Have fun.