1) I used to feel that way and then I tested myself against my younger self and was as good as ever. A lot of this could be 'in your head' pun intended.
2) Oxygen: past 30 if you do not exercises or do cardio you will probably pay a price. Everyone is different. 30 mins running will make you feel 10 years younger.
3) You may have more perspective and more distractions. In my 20's I didn't even read the news. Who cares? Now, I 'care' about all of those 'issues' and I'm constantly engaging my mind with those materials and it's a distraction. Even children, colleagues, other responsibilities - those wear on your focus. 'Young me' could just sit there and work and literally not give a thought to anything else! That's a luxury. If you can create a silent work environment without distractions maybe that might help.
2) Oxygen: past 30 if you do not exercises or do cardio you will probably pay a price. Everyone is different. 30 mins running will make you feel 10 years younger.
3) You may have more perspective and more distractions. In my 20's I didn't even read the news. Who cares? Now, I 'care' about all of those 'issues' and I'm constantly engaging my mind with those materials and it's a distraction. Even children, colleagues, other responsibilities - those wear on your focus. 'Young me' could just sit there and work and literally not give a thought to anything else! That's a luxury. If you can create a silent work environment without distractions maybe that might help.