Synonyms for Old Man (same or very similar meaning)
WordNet sense 1 (aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe):
absinthe, common wormwood, Artemisia absinthium, lad's loveWordNet sense 2 (a man who is very old):
graybeard, methuselah, greybeardWordNet sense 3 (a familiar term of address for a man):
old boyFrom the ODE community, based on WordNetadd/edit