Absolutely. You can say whatever you like. That clearly isn't in question.
Some people like to consider how what they say might be perceived, whether it's warranted and what their choice of words says about them.
This isn't strictly aimed at you Deez. However, I will say there is a very big difference between somebody asking for an opinion on something and somebody giving it unasked. Darcey Bussell, afaik, didn't ask anybody to comment on the shade of her skin, her state of mind or her choices.
It's also worth remembering that you aren't the only person commenting on this thread. If you're confident in the comments you made, then why defend them? I don't mean that in an accusatory way.
hiccup girl (sorry to single you out
) shows what constructive criticism looks like very clearly. I would argue that comments about a mid life crisis, are not constructive. You are of course free to make them and if you're happy in your mind that they're warranted, then there's nothing to discuss.