This is actually a good fit for a Wikidata SPARQL query you can run here https://query.wikidata.org/:

  SELECT ?work ?workLabel ?author ?authorLabel ?publicationDate ?ageAtPublication
  WHERE {
    ?author wdt:P569 ?birth .
    ?author wdt:P570 ?death .
    ?author wdt:P800 ?work .
  
    ?work wdt:P50 ?author ;
          wdt:P31 wd:Q47461344 ;
          wdt:P577 ?publicationDate .
  
    FILTER(?publicationDate <= ?death)
  
    BIND(YEAR(?publicationDate) - YEAR(?birth) AS ?ageAtPublication)
    FILTER(?ageAtPublication > 60)
  
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  }
  ORDER BY DESC(?ageAtPublication)
  LIMIT 300