[DaFace]

Originally Posted by htismaqe

The older you get, the less the gap matters.

Seems like I once heard a rule of "divide by 2 and add 7" as a good rule of thumb:

18 --> 16
24 --> 19
30 --> 22
40 --> 27
50 --> 32
60 --> 37
70 --> 42

Seems directionally reasonable at least.