unless they got married in their teens, this would qualify them as an elderly couple.
My parents celebrated their 40th wedding anniversary when they were 61 and 63, and while they'd be the first to admit they're no spring chickens, I don't think they quite qualify as elderly. They're both extremely fit and active, although now that they're both over 65, they're more than happy to whip out their driver's license to get the senior citizen discount whenever possible.