The
interglacial periods are, on average, about 10,000 years in length. We're at about 11,000 currently, so we're about 10% past the average. The current interglacial is the longest of the most recent five, but it is also the
coldest. The
last interglacial period was about 10,800 years long before things flipped back to glacial. Some suggest that
human activity has actually postponed the next glaciation and that without it we would already have been roughly 1/3 the way to full glacial temperatures. If so, why the rush to decrease the impact of this activity?
The big meltdown was about 15,000 years ago. Later on there was the "younger dryas event" which has been demonstrated to have been an anomaly caused by a comet that hit the residual Laurentide ice sheet.
You count your "end of ice age" time from the biggest meltdown that raises the ocean level the highest. You no longer count from the "younger dryas event".