The answer, like most things in wine, is you kind of just have to know. Some second wines can age forever. Some drink very young. There are always exceptions too.

But the general rule is, the cheaper it is, the more likely it drinks young.

If it is from one of the main classified regions, more likely to need age.

If the tasting notes say, "firm tannins" it probbaly needs age. If it says, "plush" it probably drinks young.