Facebook, Gmail, Google Search, Google Maps and YouTube are among the most popular Android smartphone apps in the US across all age-groups, according to Nielsen’s latest research on smartphone usage.

Nielsen’s latest research on smartphone usage ranked mobile apps by their active reach, looking at the percentage of Android owners who used the app within the past 30 days. Nielsen analyzed data from its device meters on the smartphones of thousands of consumer panelists who agreed to participate in Nielsen’s ongoing Smartphone Analytics research.

It turns out that Android Market and Facebook are the top two most popular apps in the 18-24, 25-34 and 35-44 age groups, with Gmail, Google Maps and Google Search fighting it out for the remaining top-5 apps across the three age-group demographics.

YouTube also fared well across all ages, coming in at number 6 in all groups, but almost two-thirds of all 18-24-year-olds had used it within the past month, compared to 56% and 51% in the 25-34 and 35-44 age-groups respectively. Google products constituted 5 of the top 6 most popular Android apps.

Perhaps surprisingly, Rovio’s Angry Birds game appealed more to the older demographic, with 35% of 35-44-year-olds playing it recently, compared to only 22% of 18-24-year-olds.

Here’s how the top 15 Android apps performed across the age-groups…

AndroidAppsByAge 520x455 Nielsen reveals most popular Android apps by age. Angry Birds appeals most to over 35s.