Absolutely yes, mate! I'll be 40 in a few months and I know the feeling well! It's up and down. Besides, it has nothing to do with age; it can happen earlier or much later. For me, it was that my drive disappeared. My job is going well, promotion, career, money... everything is good. Family... everything is good. I'm strong, healthy, fit, muscular, and get lots of compliments. But I'm not satisfied with myself, so what does a MAN try then?
Yes, at first I wanted to buy a Porsche, but then I realized that it wouldn't make me happy. I no longer had the desire or energy for parties and late nights. I still wake up in the morning and don't know what to do with myself.
One question: Are you dissatisfied with any aspect of your life? Your job? Your training? Sex? Friends?
I often reflect on myself and realize that I should be satisfied. It is and remains a struggle with oneself.