Dating age rule older
If they're in the same place in life and are in the right place at the right time, then age might be less of a factor."18 to 25."If you're between 18 and 25-years-old, it might be wise to stay within that standard young adult age range?
This would place the maximum allowable age gap at a static fifteen to twenty years or so, depending on if the speaker is referring to the physical ability to have children or the socially acceptable age.
(One common criterion for compatibility between prospective marriage or romantic partners is the difference between their ages.
In its earliest appearances, this rule is often cited as having French origins, although this citation always seems to appear in English-language (British or American) sources, leaving its true origin mysterious.
This has the advantage of allowing for a larger age gap the older the partners get; the four-year age gap between a 22-year-old and an 18-year-old is significant (and just barely allowed by this rule), but the same age gap between an 86-year-old and a 90-year-old isn't worth comment.
As Society Marched On, this became less and less the case, and in modern works a very small age gap is often considered ideal, with a maximum allowable (as opposed to "ideal") age gap proposed, and often applied equally in either direction (older man vs. One commonly-applied formula is the "half your age plus seven" rule, in which the older partner's age is divided by two and then increased by seven to reach either the ideal or minimum allowable age for a romantic partner.