Mine has a noticeable gap on PS, has been like that for years and no leaks until recently. (original CV and boots). I wouldn't worry, just check during your routine maintenance. I went about a new rotor/hub/brake job last weekend that has turned into rebooting both CV axles. DS inner boot torn, and PS showing a slight leak at the gap next to dust shield. Figured I'd just do both. It's important to order these inner oil seals for CV removal, Part # 90311-47013- they are not included in the reboot kit.
I figure my 99 is how old, and with 260k, the CVs just now need new boots. The DS CV is now all rebooted, I couldn't find any signs of wear to bearings. Back on the truck for a few more miles with new grease and boots.