I understand bald's gloss is "soon" and fast's is "almost." These are pretty similar but still different. But another bald gloss is "almost."
Die Sonne wird bald aufgehen.
I recognize that fast would not make sense here.
Beide Modelle haben fast die gleiche Leistung, die Unterschiede sind geringfügig.
I recognize that bald would not make sense here.
But what about these sentences. From Linguee's sample sentences:
Er arbeitet bald 20 Jahre in dieser Firma.
Mein Sohn ist fast sechs Jahre alt.
Can you swap out those for the other and have the sentences mean the same things?
If so, I guess that means bald and fast can overlap when you're talking about time in particular. Right?