I'm about to turn 38 in a few days, and when compared with my 28 year old self, my reaction times in faster paced games has gone down somewhat. The biggest problem I face is my arthrits and carpal tunnel getting worse.
I got hit with arthritis young, and my carpal tunnel reared its ugly head at about 30. It is more of a struggle than ever to fight the pain and play through it these days. I do my best but can only play for short bursts. Both are a 1-2 punch that has significantly reduced my playing time over the past 7 years or so.
Being more busy with work and all that do their fair share, but the most direct reason for less playtime is a combo of physical conditions that limit me.
So in the end, my reduced gaming skills and lowered reaction times are, probably, mainly due to not being able to play as much due to physical limitations and not my brain's cpu and gpu not turbo boosting enough...causing input lag to my arm and hand peripherals.
Obviously none of this will stop me from loving tech, and building/tinkering/actually using my pc for its intended primary purpose...porn watchin I MEAN FAMILY FRIENDLY PC GAMING.
And yes, i take some anti inlfammatories and have a supply of lidocaine pain relief cream ready to be used in order to extend gaming sessions. Both will be used to their safe limits when cyberpunk 2077 comes out, and hopefully crackdown 3 as well. I just hope both games are super fun and enjoyable to play.