Yeh im 34 now and honestly im probably in the best shape of my life. I know when to rest and when i can push. Im actually happy to go and do an easy 30 minute session that barely breaks a sweat if i just wanna move around. The competitiveness and ego is basically gone. Its a great thing.Resting is good and its very easy to return to the gym, however I think in your case being sick and resting will make the return a little harder the first day back.
Probably best to have a relaxed workout first day back to not tax your body, given your immune system has taken a bashing.
I think I read my body fairly well, in the last 5 years I have only had "2 ordinary workouts" where one I left after warming up and the other I had a near fainting episode due to too many red bulls lol.
The female manager who stayed with me while I recovered for about half an hour on a bed, said she was grateful I didnt have to go to hospital by ambulance. Apparently there is a ton of paper workout to fill out lol.