Robson, who did not retire at Old Trafford himself until the age of 37, accompanied Giggs on a recent trip to Shanghai and is in little doubt the midfielder is still in tremendous shape. With Paul Scholes also extending his playing career by at least another season, many more vintage displays by the veteran pair are expected next term.
"Both are fantastic professionals and it was great to see 'Scholesy' come back and play so well in the second part of the season," Robson told ManUtd.com. "The boss knows how to use them as well as he rests them at the right time and gets them in and they look fresh. Those two will do a great job for the club again next year.
"You definitely have to do things differently in terms of training. The boss maybe gives you a few more days off compared to what you normally get. But it's up to you as individuals as well. You have to look after yourself that little bit better and prepare yourself that bit better.
"Both of them are dedicated pros who want to win more things so they will go about it the right way. I can see especially Ryan, perhaps Paul depending on whether his joints allow him to do it, but I can see Giggsy playing well past 40 just because of the natural fitness of the lad."