No, Wil still has the physique of a young teenager, only with a shitty beard like one.I also like how almost literally everyone is returning for the Picard solo show, (no matter how ill-advised and needless I think it is) except Wheaton. Spiner and Sirtis are appearing, Frakes is showing up because he seems to love showing up as Riker and probably would have shown up even if he wasn't asked, and even Jeri "7 of 9" Ryan. No Wesley though.
Also, notice whenever there's some sort of con circuit reunion or anniversary shindig, everybody shows up unless they are busy. Except him. As noted earlier in thread he doesn't appear to get a heads-up on these sort of events. Almost like he's not invited because none of the many, many people involved like him.
Also note how everyone has aged averagely to reasonably well compared to how they were before in TNG while Wil Wheaton aged like raw chicken left out on a windowsill.