I may not agree with
@LTH, but it's a valid point. No one knows how these first-time head coaches will pan out. I like Macdonald, but his weakness is his lack of experience, not just as a head coach but overall. But we've seen a lot of smart, young coaches succeed recently--Sean McVay (age 30), Zac Taylor (35), Kevin O'Connell (36), DeMeco Ryans (38), Matt LaFleur (39) and Mike McDaniel (39)--which suggests that at age 36, Macdonald has plenty of experience.
(Btw, the age listed next to the coach is the age they were when they were hired.)