How long is "long ago"?

My 19-year-old neighbor is helping my girls fill up their MP3 players with music. She's letting them sample all kinds of music she's collected. I heard her singing along to Bryan Adams' "Summer of '69."

"That was one of my first two concerts!" I called down to them from upstairs. They couldn't hear me with Bryan cranked up so loud. I trotted down the stairs and poked my head into the room. "You know what? One of my first two concerts ever was Bryan Adams."

"Really?"

"Yep, I had the layered and permed '80s hair, the clothes, screaming for Bryan. Must have been '83 or '84."

"Wow."

"I think my very first concert was Rick Springfield. He passed right by. We leaned over the railing and called out, 'Hi, Rick!' He looked up and waved. I'm sure he looked right at me and smiled. I just know it."

She laughed. "Wow."

"Not that anyone even knows who he is today."

"I know who he is, and that's neat." Then she added, "I just didn't know Bryan Adams was around that long ago."

That long ago? That long ago?

Why, that was just a couple of weeks ago, wasn't it? Tonya? Angie? Was it a month or so ago?