I see a lot of people here talking about either co-washing or no shampoo. As a guy the no shampoo is a hard sell. I tend to go with shampoos meant to restore thickness because us guys are hardwired to think we'll lose our hair. I've thinned some at 40 but I also had a lot to lose and still have a lot as it is. However, I'm glad that seven years ago I came around to enjoying having curls. Maybe it took the reality of seeing other guy friends and acquaintances lose theirs.
"curls aren't just for girls."