system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Aren't Harry's parents teenagers?

They died when they were 21. They weren't kids, but they were very young. When Harry saw projections of them (Mirror of Erised, in their pictures, as ghosts when he had the Resurrection Stone), was he seeing them as they were when they died (young adults)? 

If so, when he saw them right before he faced Voldemort the final time, wouldn't they have been roughly his age?
gpt
The Mirror shows what Harry *wants* to see, not what reality was. Harry wants his family, his father and mother as actual parental figures, so he sees them in the Mirror as he wants them to be in real life: old enough to actually be his parents, not just a couple years out of Hogwarts. It's about desire, not reality.