now vs old

now

adj
  • Present; current. 

  • Fashionable; popular; up to date; current. 

adv
  • Used to indicate a context of urgency. 

  • Sometimes; occasionally. 

  • Used to address a switching side, or sharp change in attitude from before. (In this usage, now is usually emphasized). 

  • At the present time. 

  • Used to introduce a point, a qualification of what has previously been said, a remonstration or a rebuke. 

  • At the time reached within a narration. 

  • Differently from the immediate past; differently from a more remote past or a possible future; differently from all other times. 

noun
  • The state of not paying attention to the future or the past. 

  • The present time. 

  • A particular instant in time, as perceived at that instant. 

conj
  • Since, because, in light of the fact; often with that. 

intj
  • Indicates a signal to begin. 

old

adj
  • Familiar. 

  • A grammatical intensifier, often used in describing something positive, and combined with another adjective. 

  • Having been used and thus no longer new or unused. 

  • Former, previous. 

  • Of a living being, having lived for most of the expected years. 

  • Of an object, concept, relationship, etc., having existed for a relatively long period of time. 

  • That is no longer in existence. 

  • Having existed or lived for the specified time. 

  • Tiresome after prolonged repetition. 

  • Of a species or language, belonging to a lineage that is distantly related others 

  • Obsolete; out-of-date. 

  • Said of subdued colors, particularly reds, pinks and oranges, as if they had faded over time. 

  • Being a graduate or alumnus of a school, especially a public school. 

  • Indicating affection. 

  • Of a perishable item, having existed for most of, or more than, its shelf life. 

noun
  • One's parents. 

  • People who are old; old beings; the older generation, taken as a group. 

  • A person older than oneself, especially an adult in relation to a teenager. 

  • A typically dark-coloured lager brewed by the traditional top-fermentation method. 

How often have the words now and old occurred in a corpus of books? (source: Google Ngram Viewer )