OGR's are all the classes of roses that existed before 1867, the year the first hybrid tea appeared (some sources use 1836 as the date). They include albas, centifolias, bourbons, gallicas, moss roses, damasks, tea roses, china roses, noisettes, and some others I've probably forgotten. Even if these were bred after 1867, they're still called OGR's because their classes existed before that date.
The modern roses are hybrid teas, floribundas, grandifloras, large-flower climbers, miniatures, shrub roses, hybrid perpetuals, hybrid musks, polyanthas, and some others I've probably forgotten. They did not exist before 1867.
