The question “how old was she when she won the Nobel Prize? 35 42 33 21” is a multiple‑choice item whose answer depends on a specific context (a named woman and a passage or figure mentioned just before the question).

From the information available, the question appears on external Q&A/worksheet sites only as a bare line with no supporting passage, so the age cannot be determined reliably without that missing context. Because the original text or data that describes “she” is not provided here, any choice among 35, 42, 33, or 21 would be speculative rather than grounded in the source material.

To get the correct option, the surrounding sentence or paragraph (for example, the biography snippet or timeline that mentions her birth year and the Nobel Prize year) must be checked and then her age calculated from those dates.