Should the decision to move in together be judged by age?

Should an adult couple hold back on moving in together simply because of their age? What if they've been together years, are mature for their age and financially stable and feel like living together is right for them, but they're only 18/19/20, for example? Should fears relating to this, such as the reaction of their parents, stop a young couple from making the move? All opinions appreciated :)

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