Ageing matters. Risk exposure.
MacGregor
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D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000517:prevention & control* / Q000635:transmission; D000368:Aged; D015658:HIV Infections / Q000453:epidemiology / Q000517:prevention & control* / Q000635:transmission; D018451:Homosexuality, Male; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012309:Risk-Taking; D012736:Sex Education; D012725:Sexual Behavior; D006113:United Kingdom / Q000453:epidemiology