Old beardie, very lazy behavior

Hello

I have a question for anyone who knows about the behavior of older bearded dragons. Mine just had his 7th birthday in June and recently (as in the past 2 or 3 months) he has been very inactive, hiding under his bridge all day. It wasn't too odd considering he has always been quite a lazy dragon, but he would normally at least sit under his basking lamp and move throughout the tank. I took him out a week ago and he was alert, walking around my room and even ate some mustard greens and super worms, but then he just went right back under his hide and I haven't seen him since. I'm debating whether I should take him out or just leave him there and let him do what he feels? I'm worried that he hasn't eaten in a while, but don't know why he won't come out to eat on his own.

As for his living details: he lives in a 50 gallon tank, his basking side reaches about 90 degrees F directly under his basking lamp and he has a cool side with a bridge type hide. I use the reptisun 10.0 for his UVB and his diet consists of mixed dark greens, occasional fruit +veg, and once or twice a week super worms. His last poop, although a while ago, was normal looking.

Part of me thinks he is just getting old and therefore has less energy, but I want to see if anyone else has experienced this very lazy behavior in older beardies. I also thought it may be impaction.. but right after I took him out to poop, he went right back under his hide.
Thanks for reading and I would love to hear if anyone has any thoughts or has experienced this in older bearded dragons.

They seem to go through cycles of being a bit lazier sometimes. Keep an eye on his weight as if he is losing weight then he could have an underlying problem. They can slow their metabolisms down though so if his weight is stable he's probably OK and I'd let him do his thing. Based on what I've seen (not with one as old as 7 granted) they tend to come out of it and go back to normal energy levels after a while.