The Welshman made his debut for the Red Devils as a 17-year-old against Everton in 1991 and has gone on to make 953 appearances for United.
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"If I’d moved from club to club I’d be finished by now," he told the North Wales Daily Post.
"I’m lucky that I have been at one club, where I am surrounded by good players. I also have a good manager.
"I look after myself and try to train every day in order to make myself available for selection. I enjoy it as much as I can and, of course, try to contribute to the team."
The 40-year-old is out of contract at the end of the season, but says he is still keen to continue playing and is not yet thinking of retirement.
"It can be hard sometimes but I am still enjoying it. As long as that is the case I will carry on,” he added.
"I don’t know what the younger lads think of me. When I was 17 and 18 I thought 31 was ancient. Here I am at 40.
"It is a pleasure to play alongside someone like Phil Jones. He does my running for me. All I do is try and control it all."