First of all... really? Everyone else thinks it's fine for a thirteen year old to "date"? (If that's what it's called at that point)

Also... at this point in existence, the typical 18 year old is not mature, nor is the typical 21 year-old... twenty three year olds are getting there and paths start to divulge there.
And before everyone starts to jump all over all that I am very aware that my current audience is anything but "typical" and so my observations o 's are less likely to apply.

And while 23-28 is less likely to have that gap, there will often (but not always) still be problems.

A 23 year old might often have issues renting a car, and a 28 year old might actually have graduated med school at that point, already be interning and literally be making life and death decisions. An extreme example, but demonstrative of the possible life experiences available in five year's time, no?