| English | Spanish | |
|---|---|---|
| General | ||
| General | eldest | primogénito [adj] |
| General | eldest | mayor [adj] |
| General | eldest | el mayor [adj] |
| General | eldest | el más anciano [adj] |
| General | eldest | primogénito [adj] |
| General | eldest | primogénita [adj/f] |
| General | eldest | la más anciana [adj/f] |
| Law | ||
| Law | eldest | el de mayor edad [adj] |
| English | Spanish | |
|---|---|---|
| General | ||
| General | eldest son | mayorazgo [m] |
| General | eldest son | primogénito [m] |
| General | eldest daughter | primogénita [f] |
| General | eldest person | decano [m] |
| General | eldest person | decana [f] |
| General | falling easily in love (eldest son) | birriondo [adj] NI |
| Speaking | ||
| Speaking | I'm the eldest daughter in my family | soy la hija mayor de mi familia |
| Speaking | i am the eldest daughter of my family | soy la hija mayor de mi familia |
| Colloquial | ||
| Colloquial | eldest child | mayorazgo [m] |
| Colloquial | wife of eldest child | mayorazga [f] rare |
| Law | ||
| Law | eldest daughter | mayorazga [f] |
