This is the 5517th most frequent Russian word.
поздно
Late.
In this sentence, "поздно" is used to indicate that the timing for starting a new career is considered late in the context of life stages or opportunities.
Мне слишком поздно начинать новую карьеру.
It's too late for me to start a new career.
Here, "поздно" conveys the idea of arriving at a later time than expected or desired.
Почему мы пришли так поздно?
Why did we arrive so late?
In this example, "поздно" pertains to the timing being late relative to children's typical bedtime.