Question: At what age did the Mexican actress, singer and model appear on "Tu y Yo" with the 1978 winner of Miss Costa Rica?

Context paragraphs:
Karina Ramos: Karina Ramos Leiton (born July 14, 1993 in Heredia, Costa Rica) is a Costa Rican TV Host, model and beauty pageant titleholder who was crowned Miss Costa Rica 2014 and represented her country at Miss Universe 2014.

Brenda Castro: Brenda Giselle Castro Madrigal (July 25, 1992, Guápiles, Limón, Costa Rica) is a Costa Rican model and beauty pageant titleholder who was crowned Miss Costa Rica 2015 and represented her country at the Miss Universe 2015 pageant.

Elena Correa: Elena Correa (born November 3, 1990) is a Costa Rican model and beauty pageant titleholder who was appointed as Miss Costa Rica 2017.  She will now represent Costa Rica at Miss Universe 2017 pageant.

Leila Rodríguez Stahl: Leila Rodríguez Stahl (born March 30, 1942 San José, Costa Rica) is a Costa Rican public figure, painter, sculptor and winner of the Miss Costa Rica beauty pageant in 1960.  She served as the First Lady of Costa Rica from 2002 until 2006 during the presidency of her husband, Abel Pacheco.

Miss Costa Rica 2009: The Miss Costa Rica 2009 was held on March 27, 2009.  9 contestant entered representing each province and national capital.  The pageant was held in the capital city.  The location was The "Auditorio del Museo de los Niños de Costa Rica".  The winner that was crowned Jessica Umaña representing the National Capital.  Umaña, who stands 1.75 m tall, was one of the favorites for the title.  This was her second try at the crown -she had competed in Miss Costa Rica 2008-, but withdrew before the finals took place.  She decided to try again, winning the title over 8 other contestants.  The winner will enter Miss Universe 2009, Reina Hispanoamericana 2009 and Miss Continente Americano 2009.  The first runner up will enter Miss World 2009 and Miss Tourism Queen International 2009.  The second runner up will enter Miss International 2009 and Miss Intercontinental 2009.  The third runner up will enter Miss Earth 2009 and Reinado Internacional del Café 2009.

Lisette Morelos: Lisette Morelos (] ; born Lisette Garcia Morelos-Zaragoza on May 21, 1978 in Mexico City, Mexico) is a Mexican actress, singer and model.  She started her career at a young age.  She attended the Centro de Educación Artística (CEA).  Her first Telenovela was at the age of 17 in "Tu y Yo" with Maribel Guardia and Joan Sebastian.

Maribel Guardia: Maribel Guardia (] ; born Maribel del Rocío Fernández-García on 29 May 1959 in San José, Costa Rica) is a Costa Rican actress, model, singer and TV hostess.  She was winner of Miss Costa Rica 1978 and contestant in Miss Universe 1978.

Reinas de Costa Rica: Reinas de Costa Rica is a national beauty pageant in Costa Rica that selects representative to the Miss World pageant since 2007.  The Miss Costa Rica pageant stopped sending contestants to the Miss World and Miss International pageants.  The last delegate sent by the organization was in 2006.  In 2007, the franchise was acquired by the Reinas de Costa Rica organization presided by Alan Aleman.  This pageant is unrelated to the Miss Costa Rica Organization.

Mexican immigration to Costa Rica: Mexican immigration to Costa Rica comprises people who emigrated from Mexico to Costa Rica and their descendants.  Costa Rica has the most Mexicans living in Central America, aside from Guatemala.  The waves of migration from Mexico to Costa Rica started from 1970s, as they were attracted by a stable democracy, a mild climate and political stability that characterizes this country south of Central.  The Mexican population in Costa Rica reaches more than 5,000 people who exercise as professionals, doctors, secretaries, among other services.  Costa Rica is the seventh destination for Mexican immigrants in the world, and first in Hispanic America.  Unlike other destinations, most Mexicans who immigrate to Costa Rica are mainly from Nuevo León, Tamaulipas, Chihuahua, Baja California and Mexico City.  Despite having more cultural elements similar to the northern countries of Central America (Guatemala, El Salvador and Honduras), Mexicans in Costa Rica are quickly assimilated by the Costa Rican population.  From 2010, a new wave of Mexican immigrants began coming to Costa Rica, and these are mainly young professionals, who find no opportunities in their country, migrate to the Central American country.  Many others are running away from the waves of violence following the war against drug trafficking in Mexico.

Alfonso Chase: Alfonso Chase (born 1944 in Cartago, Costa Rica) is a contemporary Costa Rican author.  He was educated in Costa Rica, Mexico, Venezuela and the United States, and he began his career in poetry in 1965.  He has received numerous awards for his writing, including the Premio Nacional de Poesía twice (1967 and 1995), the Premio Nacional de la Novela (1968) and the Premio Nacional de Cuento (1975); he has also been awarded the Premio Carmen Lyra, de Literatura Infantil y Juvenil for children's literature (1978).  As well as representing Costa Rica in several international committees, he founded the Department of Publications of Costa Rica's Ministry of Culture, Youth and Sports in 1970.  He has worked at the Universidad Nacional in Heredia since 1974, and was named Fulbright Scholar in Residence at the University of Arkansas-Fayetteville in the United States in 1991-92.

Supporting paragraphs: Lisette Morelos Maribel Guardia
Answer: 17