United Kingdom, Aug. 31 -- Mark Hamill and his wife Marilou York's marriage secret is acceptance.

The dental hygienist - who tied the knot with the Star Wars actor in 1978 - also says not worrying about things that are not important is also vital for a strong relationship.

Marilou told People: "Don't sweat the little stuff.

"And also, go in knowing you're not going to change anyone. So you have to accept their quirks and their behaviour."

Interrupting, Mark said: "What quirks?"

Agreeing, he said "acceptance" and "communication" are two vital components to a happy and long marriage.

The couple - who have sons Nathan, 46, and Griffin, 42, as well as 33-year-old daughter Chelsea - met in the mid-1970s at a dentist's office, where he wa...