Randi, it looks like all of his recent labs have been great! They were right in the middle of the normal ranges! He probably is just starting to slow down a bit with normal aging! Try not to worry about him too much! It sounds like your vet is very thorough with all of the labs so I would just tell him / her what you've noticed and I'm sure they will cover anything else that needs to be checked! Keep us posted on the results!

Kim