Of course you miss the buzz, that's what makes theatre so intriguing, both back stage and front of house.
However. I could never do what I did even 5 years ago due to a lack of energy. As for holding down the job I did when I was mid-30s! but I did have hobbies which filled any gaps. Eventually

. I had to mourn a couple of jobs that I really really loved but which went tits up

. Then I got a dog and our lives changed

Do you have skills that you could take into schools, youth groups, after school clubs, Libraries, Volunteer situations? Our Council has a Volunteer Berurua? [sp] Maybe to fill a gap go to a care home and talk about what you did, that could be good for the residents in bringing back their memories?