At what age do lovies calm down?
Depends on the bird. Some of them start calming down after the first year or two and the two I have that like to nap on me started that after 2-3 years, I guess? Twinkie used to be completely insane, but now he loves to crawl into my shirt and take a nap.
Then you have birds like Craybie (Turnip). Still just as frantically energetic as the day I met him...3+ years ago. He lets me do brief snuggles now, and will occasionally preen on me, but he still has to take frequent flights around the room while squeaking madly.
If any other living creature is in the room, he must pester it.