How old are women when they have their first child? The table displays the distribution of the age of the mother for all firstborn children in the United States in 2017.
10 ‑ 14 years 1,892 30 ‑ 34 years 329,623
15 ‑ 19 years 162,536 35 ‑ 39 years 124,637
20 ‑ 24 years 395,927 40 ‑ 44 years 24,049
25 ‑ 29 years 417,162 45 ‑ 49 years 2,377

In which age classes do the median and quartiles fall?