Ellar Coltrane is currently 27 years old. He had been dating Lorelei Linklater, but eventually, they broke up. Lorelei, who is also currently 27 years, co-starred with Ellar in Boyhood. Being of the same age, both of them didn’t have much of a significant age gap. Also, they are not together.
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However, Ellar seems to be dating a girl named Olivia pepper, which has not been confirmed officially yet. Also, there are very details about the girl Ellar is dating, so it is hard to precisely disclose the information about their age gap. Because there aren’t many details about Olivia yet, and it’s unclear whether or not she’s dating Ellar, their relationship and age gap can’t be confirmed.