No doubt at all to anyone watching him that he has declined alot in the past years, specially lately, his level is much lower this year.
But its not due to age, 33 is not old at all in this day and age with our knowledge of medicine and sport and physical training and recovery, look at Federer how good he is playing at almost 40 years old, look at Lebon James at almost 36, look at other athletes, the age of decline has gone up alot or at least the career has been postponed at playing at a high level.
Messi's problem is not age, its his life and his workrate, thats his problem, look at Ronaldinho, he was a magicial and a one of a kind player, but for how long? His decline was extremely fast, in his peak young days, why did he decline? Because he was partying alot, he did not train alot or did the phyiscal work required.
Its the same with Messi, ive noticed it a while ago and im sure many of you have that Messi does not have the workrate and dedication and work ethic of some other athletes such as lebron james or even cristiano ronaldo.
The older you get the more important it is to give your 100% off court, off court work, in the gym, physical, recovery work, diet.. everything... Messi is not that kind of guy, ive noticed that ever since he got his son and then later more, he was not 100% commited to soccer anymore, he was still brilliant for a while but that spark left him I noticed and I was afraid he would decline much sooner and shaper, but he still maintained a pretty good level alltho it was not the same anymore as it was before his family life.
But now as he gets older and older it becomes more and more obvious and clear, its too bad Messi does not have the same work ethic as some other athletes that I mentioned, if he did he could be at the top of soccer into his late 30s.... he doesn't even rely on physical assets NEARLY as much as someone like Cristiano Ronaldo, and most people said that CR would decline much faster because of it... but sadly they forgot to take into account that CR has the work ethic of a robot, in everything, he puts 100% off court and does everything he can and is the first guy on the training pitch and last guy to leave... thats the kind of dedication Messi would need and he could be at the top of the game into his late 30s, but he is not that guy im sad to say, its a big weakness of his and due to this his legacy in the end will be far shorter and far worse than it could have been.