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He was probably in his 20s or 30s in the 90s when GLaDOS was being constructed but we don't really know when Portal takes place. Let's say it took place in 2020 (which is my guess knowing GLaDOS' activision was in 200- and Chell was a kid at the time but my guess is as good as any) so Ratman must be between his late 40s and early 60s. So around 50.

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