Going to be highly dependent on context. At the cancer hospital? “Old Men” might just be 80+ years. At the office, it might be 60+.
Young adult in a lot of countries will start at 18 or even younger I think? US, adulthood starts at 18 even though a lot of adult things are still closed to them (drinking alcohol, having completed college, etc). So if we mean legally a young adult is probably 18-30 whereas if we mean a young person who is starting adult life we might not mean until 22 or older when they have a chance to start a career, etc.
Elderly and other descriptors might follow the contours of eligibility for government programs like social security.
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