"a person" or "the person" ? which to use?

TheGigglingAssassin

Member
Mandarin
Hey guys! Got a sentence here that I need some help with:

However, in the US, people think "growing old" is a problem because "old" means that ( ) person is going to retire or that he can't do well in work.

Should I use "a" or "the" in the brackets? (or is both correct?) And pls explain why (preferably from a grammar standpoint).

Cheers!
 
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