Question: How old was the man for whom Āryabhaṭa numeration is named when he wrote Āryabhaṭīya?
Context: Aryabhata (IAST: Āryabhaṭa ) or Aryabhata I (476–550 CE) was the first of the major mathematician-astronomers from the classical age of Indian mathematics and Indian astronomy.  His works include the "Āryabhaṭīya" (499 CE, when he was 23 years old) and the "Arya-siddhanta". Sakan Ryokan or "Hotel Sakan" (ホテル佐勘) is an historic ryokan (Japanese inn) located in Sendai, Miyagi Prefecture, Japan.  The inn is over 1,000 years old, and is located within the spa resort named "Akiu Spa," which has four communal onsen (baths) that are supplied by natural hot springs.  The hot springs are one of the three oldest ones in Japan, and are located near the Natori River.  The inn was originally started by a man named Kanzaburo Satoh, whom the inn is named after.  Ownership of the inn has been handed down to Satoh's descendants for 34 generations.  It is located next to the 400 year old Iwanumaya Hotel. "Can I Play with Madness" is a song by the English heavy metal band Iron Maiden.  The song is the sixteenth single released by the band.  Released in 1988, it was the first single from their seventh studio album, "Seventh Son of a Seventh Son" (1988), and hit number 3 in the UK charts.  The song is about a young man who wants to learn the future from an old prophet with a crystal ball.  The young man thinks he is going mad and seeks the old prophet to help him cope with his visions/nightmares.  The prophet's advice is ignored by the young man and they become angry with each other.  The song was originally a ballad named "On the Wings of Eagles", written by Adrian Smith. The Āryabhaṭa numeration is a system of numerals based on Sanskrit phonemes.  It was introduced in the early 6th century in India by Āryabhaṭa, in the first chapter titled "Gītika Padam" of his "Aryabhatiya".  It attributes a numerical value to each syllable of the form consonant+vowel possible in Sanskrit phonology, from "ka " = 1 up to "hau " = 10. "The Water Man" (Slovene: "Povodni mož" ) was the first Slovene ballad.  It was written in the spring of 1826 by the Slovene Romantic poet France Prešeren and was a narration about Urška, a flirt from Ljubljana that ended in the hands of a handsome man who happened to be a vodyanoy ("povodni mož" ).  The poem was based on a story from "The Glory of Carniola", about a dance at Old Square in Ljubljana in July 1547, when Urška Šefer was enchanted by a vodyanoy and tugged to the Ljubljanica.  Prešeren wrote it due to his unfulfilled love towards Zalika Dolenc.  In the first publication of the poem Urška was named Zalika.  Later, in Prešeren's Poems (1847), she was named Urška. Edward Page Mitchell (1852–1927) was an American editorial and short story writer for "The Sun", a daily newspaper in New York City.  He became that newspaper's editor in 1897, succeeding Charles Anderson Dana.  Mitchell was recognized as a major figure in the early development of the science fiction genre.  Mitchell wrote fiction about a man rendered invisible by scientific means ("The Crystal Man", published in 1881) before H.G. Wells's "The Invisible Man", wrote about a time-travel machine ("The Clock that Went Backward") before Wells's "The Time Machine", wrote about faster-than-light travel ("The Tachypomp"; now perhaps his best-known work) in 1874, a thinking computer and a cyborg in 1879 ("The Ablest Man in the World"), and also wrote the earliest known stories about matter transmission or teleportation ("The Man without a Body", 1877) and a superior mutant ("Old Squids and Little Speller").  "Exchanging Their Souls" (1877) is one of the earliest fictional accounts of mind transfer.  Mitchell retired in 1926, a year before dying of a cerebral hemorrhage. Jean Claude Jacob was a serf from the Jura Mountains, supposedly 120 years old, who was brought from his native place to figure as "dean of the human race" in Paris at the Festival of the Federation of July 1790.  Thomas Carlyle wrote of Jacob in :Having seen the Human Species itself, to have seen the 'Dean of the Human Species,' ceased now to be a miracle.  Such 'Doyen du Genre Humain, Eldest of Men,' had shewn himself there, in these weeks: Jean Claude Jacob, a born Serf, deputed from his native Jura Mountains to thank the National Assembly for enfranchising them.  On his bleached worn face are ploughed the furrowings of one hundred and twenty years.  He has heard dim patois-talk, of immortal Grand-Monarch victories; of a burnt Palatinate, as he toiled and moiled to make a little speck of this Earth greener; of Cevennes Dragoonings; of Marlborough going to the war.  Four generations have bloomed out, and loved and hated, and rustled off: he was forty-six when Louis Fourteenth died.  The Assembly, as one man, spontaneously rose, and did reverence to the Eldest of the World; old Jean is to take seance among them, honourably, with covered head.  He gazes feebly there, with his old eyes, on that new wonder-scene; dreamlike to him, and uncertain, wavering amid fragments of old memories and dreams.  For Time is all growing unsubstantial, dreamlike; Jean's eyes and mind are weary, and about to close, — and open on a far other wonder-scene, which shall be real.  Patriot Subscription, Royal Pension was got for him, and he returned home glad; but in two months more he left it all, and went on his unknown way. Antidosis (Ancient Greek ἀντίδοσις ), is the title of a speech treatise by the ancient Greek rhetorician, Isocrates.  The "Antidosis" can be viewed as a defense, an autobiography, or rhetorical treatise.  However, since Isocrates wrote it when he was 82 years old, it is generally seen by some people as an autobiography.  The title literally translates as “an exchange,” and was applied in ancient Greek courts as a peculiar law pertaining to an exchange of estates between two parties.  If one of the 1200 wealthiest Athenians eligible was tasked with the performance of a public liturgy and financing one of the many public concerns of Athens, then he could avoid the duty by nominating a richer man who was more qualified than himself to perform it.  If the supposedly richer man disagreed with the terms, then the entirety of their estates would be exchanged and the now more wealthy man would have to perform the liturgy, as originally planned.  The law inspired Isocrates' "Antidosis", which was written in the form of a court case where Isocrates had to defend himself from a charge of corrupting the youth by teaching them how to speak well in order for them to gain an unfair advantage over their peers.  Although this work is put forward by Isocrates as his imagined defense in a legal case, it is more a treatise on morality and teaching. Morishima Chūryō (森島 中良 , 1756 – December 29, 1810) was an Edo period Japanese author of popular fiction who also wrote a number of works in the field of rangaku (Western studies).  He wrote under many pen names, including Manzōtei, Shinra Manzō (or, conventionally, Shinra Banshō), and Tenjiku Rōjin ("old man from India").  The latter constituted an allusion to the pen name Tenjiku Rōnin ("masterless samurai from India"), used by Hiraga Gennai, to whom Chūryō was the principal literary successor.  Chūryō co-authored several plays with Gennai early in his career, and went on to write in almost all of the many genres of popular fiction that were collectively known as gesaku.  He also wrote kyōka, or comic waka poetry, under the pen name Taketsue no Sugaru.  Chūryō was the younger brother of Katsuragawa Hoshū, a shogunal physician and leading scholar of rangaku. Simon Sheppard is a writer of gay erotica and a sex-advice columnist from San Francisco.  He is the author of many books of gay sex writing, including "Man on Man: The Best of Simon Sheppard", "Sodomy!" , "Jockboys," "Kinkorama: Dispatches From the Front Lines of Perversion," "In Deep", and "Sex Parties 101".  He is also the editor of "Homosex: 60 Years of Gay Erotica," winner of the 2007 Lambda Literary Award for LGBT erotica; the anthology "Leathermen"; and is the coeditor of the anthologies "Rough Stuff" and "Roughed Up."  Sheppard's work is wide-ranging, often combining history, philosophy, and culture — high and low — with hardcore sex.  His first book, "Hotter Than Hell and Other Stories", won the Erotic Authors Association Award for Best Collection of the Year, and the title story of "In Deep" was shortlisted for the Rauxa Prize for Erotic Fiction.  His work has also appeared in over 300 anthologies and magazines, including many editions of "Best Gay Erotica" and "The Best American Erotica".  He wrote the syndicated column "Sex Talk," and the online columns "Perv" and "Notes of a Cranky Old Fag."  The online serial "The Dirty Boys' Club,” which he wrote for OutPersonals, was published as a novel in 2012.  He also curates and co-hosts, with Carol Queen, the San Francisco performance series Perverts Put Out!  Sheppard is openly gay, and is active in the queer artistic, political and AIDS-activist communities.  He lives with his husband in San Francisco, where "San Francisco" magazine dubbed him “our erotica king.”
Answer: 23