When asked if he ever considered an early international retirement, Vardy told BBC: "I don't think past tomorrow, to be honest. If I start thinking too far ahead, I'll forget something.
"It's probably a good job I still feel 21. If I felt my age, I'd be a bit more tired with my legs."
He is likely to feature in England's games at Wembley against Germany and Brazil as Gareth Southgate gauges the squad's progress ahead of the World Cup in Russia.
"I just have to keep on doing what I'm doing. I've been selected because of what I'm doing for my club," he added.
"I need to get on that training field and make sure I'm putting in 100 per cent and I'm in the manager's plans. If that's to come off the bench and make an impact then that's what it will be."
England host world champions Germany on Friday and Brazil four days later.
(Reporting by Hardik Vyas in Bengaluru, editing by Ed Osmond)
