Well, the paper says that the ageing process in those materials means that they relax to equilibrium more slowly, and this keeps them in the "creep regime". I read it as a statement of how to avoid becoming a creep, but you could also read it as a statement on how to avoid creeps. The literature of solid-state physics is full of inspiration here: papers about the creep transition, the universal creep equation, the dependence of frustration on twisted boundary conditions... And even if it falls flat as humor, you learn some physics along the way.