Learner dad: You’ve finally gone grey’. Is that an ok thing to say to a 52-year-old man?

I’m not going to bother with my buddy Michael any more. He’s been a friend of mine for 25 years, best man at my wedding, straight- talking, always in a good mood, the only guy you need to meet if you’re looking for a shot of positivity.
The one time he put a foot wrong was when he dropped half the pamphlets in a giant puddle on my wedding day, but look, we all make mistakes.