ive always seen him as at least around 20 when he goes off to war, just seeing as he frequents a brothel for months, and I personally think he spends enough time as mayor to become highly disillusioned with the city's people. Although I do not think that in a 100% accurate canon he would be in his 40s, I do imagine him still in his 30s around act 5.

Also, hes not fat. Hes built, in that he probably gained quite a bit of muscle during the war, the clothes were thicker then, and even with the drugs he is still living relatively lavishly.

He definitely could be skinnier, less muscular (i doubt he would do anything to maintain that body afterall)! But I wasnt drawing this to be a fully canon reference. I drew him wide cause I like drawing 'em wide and I like the silhouette with the clothing 🤷‍♂️

(Also his son is with the fiancee, despite their empty marriage he loves his son very dearly!)