GLENDALE — Mayor Fred Jensen faces two challengers in November’s election, and both say they would emphasize making the southern Douglas County town more inviting for youth and families. Jensen, 68, who has served as mayor for the past 2 1/2 years, is running against Annette Merrill, 57, and Lucille Martin, 53. The incumbent mayor said he’s running for re-election because he wants to improve Glendale’s infrastructure, support existing businesses and encourage new ones to locate in the city. Merrill and Martin said they’d also work to strengthen Glendale’s economy. “One of my main concerns is we have very few …