We actually still live in an ice age. What most people think of as "an ice age" or "the last ice age" was actually a glaciation period of the current ice age. There were times in the past when the Earth was much warmer than it is today. Despite the rising global temperatures we're measuring and the resulting climate change, it remains to be seen whether the current ice age is close to ending.

These videos from the Atlas Pro channel look at ice ages from three different angles. They intermix usage of ice age and glacial period and related terms. The real point is to understand what the Earth was like during, before, and after the last glacial period of the current ice age.

I especially enjoyed the last video in the series and you don't really have to watch these videos in sequence.

Watch 1 of 3: What Caused an Ice Age? from YouTube
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Watch 2 of 3: The Geography of the Ice Age from YouTube
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Watch 3 of 3: The BIOGEOGRAPHY of the Ice Age from YouTube
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Anyone who wants to write stories set in prehistoric or glacial time periods should watch these videos.