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A love story more than 8 decades in the making reached a high point last week ... when Ivan O'Neil and Gerry Souhrada got married in Montana.

The couple, both 91, said their "I dos" in front of immediate family July 25 in Lakeside ... after more than a decade of dating. The nuptials were also live streamed on Facebook so loved ones all over could watch.

Ivan and Gerry met in first grade and grew to be friends during high school. They both went on to get married to other people, but continued to bump into each other over the years at various local events, and committee meetings to plan their class reunions.

They were both mourning the loss of their spouses, Marian and Bob 13 years ago when they ran into each other at a breakfast diner.

Ivan was reportedly there with his hiking group, the "Over the Hill" gang, and went over to say hello to Gerry. Later in the day, Gerry mentioned to her son, if someone as nice as Ivan were to ask her out, she'd say yes.

Later that evening, he asked her to be his date to a banquet because it "wouldn't be any fun to go alone."

They have been together ever since, love to travel and have been all around the world. 

According  to TMZ, Ivan actually asked Gerry to marry him early on in their dating years, but she wasn't ready after losing Bob. 

However, when he recently popped the question again, she said yes.