Sandbox and aging delay are similar in meaning and many SEO experts use them interchangeably. Aging delay is more self-explanatory – sites are “delayed” till they come of age. Well, unlike in legislation, with search engines this age is not defined and it differs. There are cases when several sites were launched in the same day, were indexed within a week from each other but the aging delay for each of them expired in different months. As you see, the sandbox is something beyond your control and you cannot avoid it but still there are steps you can undertake to minimize the damage for new sites with new domains.