He has settled well since retiring as an international upon leaving PSG to join United at the start of the season, scoring 16 goals in all competitions, 11 of them in the Premier League.
"The older I get, the better I get, like red wine. You like red wine? I'm a perfect example of that," Ibrahimovic, who scored both goals in a 2-0 win over West Bromwich Albion on Saturday, told British media.
"I'm settling in. I feel happy, I feel good. Even if I'm 35, in my mind I'm 20. I think I could play also at 50, but it's not down to me.
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"I've played in different championships, in different countries, and you need to adapt your body to the game and the way it's played here."
The win at West Brom kept United sixth in the table ahead of the visit of second-bottom Sunderland on Dec. 26.
(Reporting by Hardik Vyas in Bengaluru)
