seventy

number (plural seventies)

• the number equivalent to the product of seven and ten; ten less than eighty; 70:about seventy people attended seventy were arrested (Roman numeral: lxx, LXX)
• (seventies) the numbers from seventy to seventy-nine, especially the years of a century or of a person’s life:Dad was now in his seventies
• seventy years old:she was nearly seventy
• seventy miles an hour:doing about seventy