I found a sentence in a model answer to a test question at http://www.ielts-exam.net/academic_writing_samples_task_1/162/
"The second graph shows that employer support is maximum (approximately 60%) for the under 26yr students. It drops rapidly to 32% up to the third decade of life, and then increases in late adulthood up to about 44%."
Are "up to the third decade of life" and "in late adulthood" correct and natural?
"The second graph shows that employer support is maximum (approximately 60%) for the under 26yr students. It drops rapidly to 32% up to the third decade of life, and then increases in late adulthood up to about 44%."
Are "up to the third decade of life" and "in late adulthood" correct and natural?