Two stock characters of theater are the senex amans, an old man unsuitably in love with a much younger woman, and the senex iratus, an old man who irrationally opposes the love of the young couple.1
Sir Alan Lascelles used the pen-name "Senex" when writing to The Times in 1950 setting out the so-called Lascelles Principles concerning the monarch's right to refuse a prime minister's request for a general election.