The 29-year-old claimed the Premier League golden boot with 26 goals last season as United won the title in the Dutchman's first campaign at Old Trafford.
But he claims that he is always getting better as a result of studying DVDs of his performances to eliminate any weaknesses.
"When Sir Alex Ferguson told me he wanted to sign me from Arsenal last year, I said to him that I was still improving as a player," he was reported as saying by The Mirror.
"I may be 29 now, but everything I do in training is tailored so that I can become a better footballer.
VAN PERSIE LATEST
Manchester United are 2/1 with bet365 to win the Premier League next season
"I would collect a new one every Monday morning and I could not wait to watch it because it enabled me to study both my good moments and my bad moments in every game I played.
"When I was younger, that kind of attention to detail was not possible.
"Now I get a full understanding of whether I made the right or wrong choices in every game. I have continued to do that at United. Sometimes you think you have done okay in a game but, when you watch it again from a different angle, you realise that there were better options you could have taken. I find that kind of detail so important for my own development.
"It is not about watching my goals again. It is about identifying mistakes and the desire to improve. I want to learn all the time."The Dutchman, who was named captain of his country on Friday, took time to praise Sir Alex Ferguson after the Scot retired following over 26 years' service to United.
"I have been lucky to work with many great managers," Van Persie continued.
"Bert van Marwijk at Feyenoord and Netherlands, Marco van Basten and Louis van Gaal at Netherlands and Arsene Wenger at Arsenal. I learned something from every single one of them, yet the great thing about working under Sir Alex last season was the level of expertise.
"I loved the way Sir Alex and the coach Rene Meulensteen prepared us for matches. They would design training sessions to suit both the team and the individual.
"It was like being a musician in an orchestra. We had a conductor and when everybody did his job the way he was expected to do it, the end product was fantastic.
"We used to train all week on a certain pattern with our attacking play.
"Every detail had to be right, but if we scored on Saturday using the things we had learned in training then the joy was incredible."