There are varying definitions in this community.
This is the Official GYO formula:
- Younger age is Y, Older is Z
- Formula: 4/3Y ≤ Z
- Younger = 18, 1.333… * 18 <= Z, Older >= 24
- Younger = 30, 1.333… * 30 <= Z, Older >= 40
- Younger = 38, 1.333… * 38 <= Z, Older >= 50.6

The GYO community is sympathetic to the smaller age differences when partners are younger. As partners age, differences in age become less societally significant so a larger age gap is needed to qualify as a GYO relationship.
The perception of age difference changing as we get older just shows how arbitrary age really is.
Younger Age Range | Older’s Lower Limit | Couple’s Age Difference | Older’s years to 100 |
---|---|---|---|
18 | 24.00 | 6.00 | 76.00 |
19 | 25.33 | 6.33 | 74.67 |
21 | 28.00 | 7.00 | 72.00 |
23 | 30.67 | 7.67 | 69.33 |
Younger Age Range | Older’s Lower Limit | Couple’s Age Difference | Older’s years to 100 |
---|---|---|---|
25 | 33.33 | 8.33 | 66.67 |
27 | 36.00 | 9.00 | 64.00 |
29 | 38.67 | 9.67 | 61.33 |
Younger Age Range | Older’s Lower Limit | Couple’s Age Difference | Older’s years to 100 |
---|---|---|---|
40 | 53.33 | 13.33 | 46.67 |
42 | 56.00 | 14.00 | 44.00 |
44 | 58.67 | 14.67 | 41.33 |
Attraction defined:
- Teleiophilia – Sexually mature young adults, 18 – late 30s
- Mesophilia – Middle aged adults, 40s – late 50s
- Genontophilia – Old adults, 60+
Thanks to /u/justaguy0021 for the formula optimization and proof. https://imgur.com/qZnuPZA
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