Imagine if the whole world was on some global time schedule.
UTC.
What's the fascination with this topic? Time zones are a major accomplishment because they allow us to schedule things further than our city limits. A train schedule leaving London and going to Paris, Cologne, Berlin, Warsaw, Kiev, Moscow, Yekaterinburg, Novosibirsk, etc. would be difficult to plan without them. Even this new time, let's call it BST, still needs time zones. Adjacent places need to agree on a common time. So we have accomplished nothing other than people having to learn their new 7am is 16:00. Which is counterintuitive.
The only country that clearly doesn't give a shit about time zones is PR China. And the only reason why you haven't heard many people thousands of miles west of Beijing having to live on Beijing time complain is the fact that it's the more sparsely populated areas, the more troubled, and the fact that criticising a decision by the communist party carries the danger of being sent to a reeducation camp even if you're neither a Uyghur nor a Tibetan.
Abolish DST and the few half hour zones and UTC will be just fine.
Everybody from a more recent generation looks on average younger than the generations before. In the middle ages people didn't have sunscreen and bathed once a year. But even if you look at older movies, Sean Connery is 31 in Dr No but he looks like in his 40s. All those cigarettes, the booze, the lack of regular exercise, and only eating full Scottish breakfasts all the time. Fast forward to today where more people worry about their appearance and next to not smoking, not drinking, eating healthy, exercising, etc. people have a range of cosmetics and/or cosmetic surgery at their disposal. Of course they look younger.