Also don't forget that height gap and the like can be a hell of a thing regardless of age. Some people in their 30s can be shorter and look younger than some people in their 20s. In terms of at least height, imagine a woman the height (5'10) and age (30) of Taylor Swift dating a 35-40 year old woman that has a height around 4'10-5'2. With that scenario there could be up to a foot of height difference.