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It's hard to believe that Princess Diana was thrust into the spotlight at just 19 years old.

News of the late royal's engagement to Prince Charles became public in February of 1981, just five months before she tied the knot in front of 3,500 guests (and millions upon millions of viewers around the world).

And now, Earl Charles Spencer is opening up to Oprah Winfrey about his perspective on the memorable engagement news.

After recalling just how young Diana was, both Oprah and Spencer agree that "19 [years old] is just astonishing."

"Well, do you know I was away at school and it was boarding school so I was really in an isolated place," he told the media mogul when asked how he heard about the news.

"I really had no idea what a big deal it was. I was a fairly dumb 17- or 16-year-old boy who was more interested in sports and girls and things."

Spencer also admitted that growing up with a sibling as well-known around the globe as Diana was nothing short of a strange phenomenon.

"I always found it quite an odd perspective on life that I was the younger brother of somebody who became so famous," he told the 61-year-old host.

For more from Spencer's interview with Oprah, be sure to check out the upcoming episode of Oprah: Where Are They Now? airing Sunday, April 5 at 9 p.m. on OWN: Oprah Winfrey Network.