Renault appeared to be mid to late 30s before. I'd left his appearance largely undefined before now, I believe, but he'd been with Apollodorus for a long time. The change in appearance gives the magi an indication of just how long.
"I'm well enough for a dying man. I have, I expect, no more than a fortnight left in me before my time is up. Apollodorus warned me of what was to come, so I have most of my personal matters attended to, and am wrapping up my business with the covenant's books and handing it off to another capable steward[1]."
"That book," he says, indicating the one in the display case that is glowing, "is enchanted such that it may not leave the aura. It is master Apollodorus magnum opus on the Art of Rego, far surpassing anything in quality or depth of knowledge that has existed to date within your Order. " Renault moves to the writing desk and opens it and pulls out a scroll, "Here is Apollodorus will, copies to be sent to Maris, and the Greater and Lesser Secundus of House Jerbiton. I believe the maga Laetitia has another copy in her possession." At this he indicates Laetitia ((who I'm presuming follows Fiona)) who is standing outside Apollodorus' sanctum, in the studio. Despite all of her efforts Laetitia is unable to proceed within his sanctum, though others have been able to do so.
[1] Someone is free to design a capable steward here, if they should be interested in stories of commerce, grog handling, etc. Otherwise, he'll be a background character.