This isn't a headcannon, but, it seems like know ever notices how young Laurens was when died. Cause he died when he was 28 years old. Sure, he wasn't as young as Philip, but he was still young!

And Alexander died when he was 47, Which is amazing considering all he did in his life!

And there's a chance he was YOUNGER than that, a lot of people back then lied about their age by a few years.