The 'Indiana Jones' actor stars as a disgruntled scientist Robert Stonehill in new film 'Extraordinary Measures'.
"When it comes to options - I'm 67-years-old. The option is to play those things that are age-appropriate," Sky News quoted him as saying.
He added: "That's just a demographic reality of the business. I'm clearly not 35 anymore. I haven't been 35 for a long time. That's ok.
"It's always been my ambition and my understanding that whatever the state of the movie business is, the key is being useful.
"It means being useful to work, useful to the process, useful as an actor - not a pain in the ass."
Referring to his upcoming film, he said: "What's interesting about Stonehill is that he is the very definition of unlikable - almost callous.
"For me, especially with the age range of characters I can play, it's a worthwhile investment of my time.
"I can continue to feed opportunistically and find things to do. I have a film coming out in July [the romantic comedy Morning Glory] that [I] had nothing to do with."