Yes, it's correct. It's a conditional. 2).
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Anonymousso that the portrait should age and he (should) remain forever young.In this environment, should, would, might, and possibly even could are all possible with no change of meaning. It has a subjunctive flavor. I'd call it a periphrastic subjunctive. It's more literary than conversational, and seems (at least to American speakers) old-
fivejedjonIt's correct, but I don't think it's conditional I think it's closer to '5. Used in a clause with ‘that’ expressing purpose:in order that training should be effective it must be planned systematically '.I think you're right.