Olivia Newton-John, who ultimately starred as Sandy in "Grease," was not the first choice for the role. The actress who turned down the opportunity was initially offered the part but declined. That actress was Susan Dey, known for her role in "The Partridge Family." Dey's decision opened the door for Newton-John, who went on to deliver an iconic performance, making the character of Sandy a beloved figure in musical cinema. "Grease," released in 1978, became a cultural phenomenon and remains a classic to this day.

You can watch the original "Grease" movie on various streaming platforms such as Amazon Prime Video, Apple TV, and Paramount+. It may also be available for rent or purchase on platforms like Google Play Movies and Vudu. Check your local cable provider for any on-demand options as well. Availability may vary based on your region, so it's a good idea to search for it on your preferred service.

"Grease" is not a 1950s movie; it was released in 1978. However, it is set in the 1950s and captures the culture, fashion, and music of that era, particularly focusing on teenage life and rock 'n' roll. The film features iconic songs and dance numbers, with a storyline centered around the romance between Danny Zuko and Sandy Olsson. Its nostalgic portrayal of the 1950s has made it a beloved classic, despite being produced in the late 1970s.

"Grease" is generally considered suitable for older children and teens, but it may not be ideal for an 8-year-old. The film includes some mature themes, innuendos, and references to teenage relationships, which might not be appropriate for younger viewers. Additionally, there are scenes with suggestive content and some mild language. It's best for parents to watch it first or read detailed reviews to determine if it's appropriate for their child based on individual maturity and sensitivity.